Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons...
-
Upload
loreen-newton -
Category
Documents
-
view
226 -
download
0
Transcript of Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons...
![Page 1: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/1.jpg)
Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New
Route to Carbosilane Dendrons
Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire & Narayan S. Hosmane
Department of Chemistry and BiochemistryNorthern Illinois University
![Page 2: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/2.jpg)
Carborane Clusters in Materials Science
• Polymers– Linear/Branched Polymers– Coordination polymers (Metal-Organic frameworks)
• Dendritic Structures• Liquid Crystalline Substances
![Page 3: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/3.jpg)
What makes carborane clusters attractive to make polymeric materials?
• High thermal stability– Insertion of carborane cage into polymer backbone
dramatically increases the thermal stability • 3-D cage structure• Almost same size as benzene
– A benzene ring can be replaced with a carborane cage– Ease of functionalization of a carborane cage
![Page 4: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/4.jpg)
Linear/Branched Polymers
![Page 5: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/5.jpg)
Conducting Polymers: Electropolymerization of carboranyl functionalized pyrroles and thiophenes (1 of 2)
• Heterocyclic conjugated polymers, such as polypyrrole and polythiophene are important class of conducting materials
• Incorporation of icosahedral o-, m- and p-carborane clusters into such polymers greatly enhances thermal and electrochemical stabilities in comparison with unsubstituted polythiophenes and polypyrroles
• The electropolymerization process is more favorable in the ortho carborane substituted thiophenes – Lower oxidation potential is required in this case
• Incorporation of Ortho carborane into thiophene polymer backbone dramatically increases the electrical conductivity of the polymer
Hao et al., Chem. Comm., 2007, 4387; Hao et al., Chem. Mater., 2007, 19, 6195; Fabre et al., Macromolecules, 2006, 39,112-119
![Page 6: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/6.jpg)
Conducting Polymers: Electropolymerization of carboranyl functionalized pyrroles and thiophenes (2 of 2)
Hao et al., Chem. Comm., 2007, 4387; Hao et al., Chem. Mater., 2007, 19, 6195
![Page 7: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/7.jpg)
Silyl-Carborane Hybrid Diethynylbenzene-Silylene Polymers
Kimura et al., Chem. Mater., 2003, 15, 355-362
![Page 8: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/8.jpg)
Phenylene ether carboranylene ketone (PECK) polymer
Fox and Wade, J. Mater. Chem., 2002, 12, 1301–1306
Thermal stability upto 1000 oC
![Page 9: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/9.jpg)
Coordination polymers (Metal-Organic frameworks)
![Page 10: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/10.jpg)
Coordination Polymers with Carborane Anions
• Coordination polymers are highly ordered infinite 1D, 2D, 3D coordination complexes
• Such materials have substantial empty space where guest molecules or counter ions can be included
• Carboranes have acidic C-H groups capable of forming H-bonding interactions
• Many carboranes are anionic in nature and used as weakly coordination anions– Icosahedral mono carborane [CB11H12]-
– Cobalt (III) bis(dicarbollide) [Co(C2B9H11)2]-
![Page 11: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/11.jpg)
Coordination Polymers with Carborane Anions: Silver Dinitrile Complexes
Westcott et al., Inorg. Chem. 2004, 43, 3663-3672, Hardie, M.J., Journal of Chemical Crystallography, 2007, 37, 69
![Page 12: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/12.jpg)
Hydrogen Sorption Properties of Carborane BasedMetal-Organic Framework Materials
• Carborane-based MOFs, were made with Zn(II) coordination of the deprotonated form of 1,12-dihydroxycarbonyl-1,12-dicarba-closo-dodecaborane
• The solvothermal synthesis instead yielded a more complex MOF of the formula[Zn3(OH)(p-CDC)2.5(DEF)4]n (2) [DEF ) diethylformamide]
• The solvent free version (4) was prepared by heating 2 at 300 oC
Farha et al., J. Am. Chem. Soc. 2007, 129, 12680-12681
![Page 13: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/13.jpg)
Hydrogen Sorption Properties of Carborane BasedMetal-Organic Framework Materials
Farha et al., J. Am. Chem. Soc. 2007, 129, 12680-12681
![Page 14: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/14.jpg)
Hydrogen Sorption Properties of Carborane BasedMetal-Organic Framework Materials
• The solvent free version of the MOF shows remarkable hydrogen absorption capability
• At 1 atm it takes up about 6 additional H2 molecules per [Zn3(OH)]+5 cluster
Farha et al., J. Am. Chem. Soc. 2007, 129, 12680-12681
![Page 15: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/15.jpg)
Dendrimers&
Liquid Crystalline Substances
![Page 16: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/16.jpg)
Dendrimers
• Dendrimers are highly ordered, regularly branched, globular macromolecules prepared by stepwise iterative approach
• Dendritic structures have three distinct architectural regions– A core or focal moiety
– Layers of branched repeat units emanating from the core
– End groups on the outer layers of repeat units
Grayson, and Frechet, Chem. Rev., 2001, 101, 3819-3867
![Page 17: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/17.jpg)
Liquid Crystals
• Liquid crystals are considered as the fourth state of matter.– Intermediate between
crystalline solid state and liquid state
• Liquid crystals based on Dendrimers have been commercially available– PAMAM [Poly(amidoamine)]
– PPI [Poly(propyleneimine)]
Binnemans, K. Chem. Rev., 2005, 105, 4148-4204
Abdallah, D.J., et al, Liq. Cryst., 2000, 27, 831; Kanazawa, A., et al., J. Am. Chem. Soc.,2001, 122, 3053 & 1997, 119, 7670; Kanazawa, A., et al., Angew. Chem. Int. Ed. Engl., 2000, 39, 612; Stebani, U., Angew. Chem. Int. Ed. Engl., 1996, 35, 1858; Stebani, U., Adv. Mater., 1995, 7, 578
![Page 18: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/18.jpg)
General Applications
Dendrimers
• Dendritic Box- – Encapsulates small organic
molecules and control their release• Metallodendrimers show redox,
magetic, photo-optical properties• High turnover transition state
catalysts• Drug/ gene delivery agents• Hybrid materials, coatings,
lubricants, adhesives etc.
Grayson and Frechet, Chem. Rev., 2001, 101, 3819; Chem. Rev.,1999, 99, 845; Jensen, Science, 1994, 266, 1226; Piotti, M.E., J. Am. Chem. Soc., 1999, 121, 9471; Gene Ther., 1997, 4, 823; Nucleic Acids Res., 1996, 24, 2176.
Liquid Crystals
• Electronic display (LCDs)• Ion conductive materials• Organized reaction media
– Ionic liquids –Alternative to volatile organic solvents
• Functional nanostructured materials from ionic-self assembly
• Molecular electronics• Electrolytes in the dye-sensitized
solar cells
Binnemans, K., Chem. Rev., 2005, 105, 4148.,Kato, T., Science, 2002, 295,2414., Ohtake et al., Macromolecules, 2000, 33, 8109., Chem. Comm., 2000, 1911., Adv. Mater., 2003, 15, 673., Nature, 1991,
![Page 19: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/19.jpg)
Advantages of Incorporating Boron
• High Thermodynamic and chemical stability– Flame retardant materials and coatings
• High neutron capture cross section of 10B (highest of all light elements)– Radiation shield coatings
• Medicinal applications (BNCT and BGdNCT)– Adequate boron concentration in the cell may be achieved
• 20-35 μg 10B/gm of tumor cell– Water solubility may be achieved
• By decapitating the boron cage (by making Na and K salts)• By enhancing the outer hydroxyl group ratio to the carborane to 8:1
• Unique steric and electronic molecular features – Molecular symmetry and conformational mobility plays significant role in
stabilization of liquid crystalline phases
Hawthrone et al., Angew. Chem. Int. Ed. Engl., 1995, 34, 1332; Parrot et al., J. Am. Chem. Soc., 2005, 127, 12081; Parrot et al., Langmuir, 2006, 22, 5251; Benhabbour et al., Macromolecules, 2007, 40, 5678, Gonzalez-Camp et al , Macromolecules, 2007, 40, 5644; Org. Lett., 2006, 8, 4549; Inorg. Chem., 2006, 45, 7815 & 2001, 40, 6622; Chem. Mater., 1998, 10, 2399
![Page 20: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/20.jpg)
Carborane Containing Dendritic Structures
Newkome et al., Angew. Chem. Int. Ed. Engl., 1994, 33, 666; Qualmann et al., Angew. Chem. Int. Ed. Engl., 1996, 35, 909; Parrot et al., J. Am. Chem. Soc., 2005, 127, 12081; Parrot et al., Langmuir, 2006, 22, 5251; Benhabbour et al., Macromolecules, 2007, 40, 5678, Gonzalez-Camp et al., Macromolecules, 2007, 40, 5644; Nunez et al., Org.Lett., 2006, 8, 4549; Galie et al., Inorg. Chem., 2006, 45, 7815, Yao etal., Organometallics, 2003, 22, 4381
![Page 21: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/21.jpg)
Synthetic Approaches
Core
Growth Growth
Branching UnitSurfaceGroup
Divergent approach- Dendrimers are built stepwise from a small polyfunctional core and through the reiterations of a sequence of reactions
Convergent approach- Dendrimers grow from the exterior of the molecule and progress inward. After sufficient repetition of the process, these dendrons finally attached to a polyfunctional core
Chem. Rev., 2001, 101, 3819 & 1999, 99,845
![Page 22: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/22.jpg)
SiCl4 Mediated Cyclotrimerization of Aryl Ketones
Yang et al., J. Am. Chem. Soc.,2005, 3278; Bao et al., Chem. Eur. J., 2006, 3287; Cao et al., J. Org. Chem., 2004, 6050
C3 Symmetric Trimers
![Page 23: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/23.jpg)
Mechanism for Triple Condensation of Ketones
R
CH3
OHH2C
OH
R
+OH OH
RRH3C + -H3O+ CH3 O
RR
R
CH3
OH+CH2 OH
RR
OH
R CH3
R
OH
R
H
-H3O+
CH3
R
O
R
H
R
HEnolise CH2
R
OH
R
H
R
H
R
H
R ROHHH
H
-H2O
R
H
R
H
H
R
![Page 24: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/24.jpg)
Synthesis of 9-Benzyl derivatives of Carboranes
Dash, B. P.; Satapathy, R.; Maguire, J. A.; Hosmane, N.S. Org. Lett.2008, 10, 2247-2250
CO
CH3Br
1) AlCl3
2a R = H (82%)2b R = CH3 (75%)
2)
3) CH2Cl2, 50 oC
(1)
R
H
CO CH3
R
H
![Page 25: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/25.jpg)
CO
CH3
H
H
![Page 26: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/26.jpg)
Silicon Tetrachloride Promoted Cyclotrimerizations of 9-Benzyl derivatives of Carboranes
Dash, B. P.; Satapathy, R.; Maguire, J. A.; Hosmane, N.S. Org. Lett.2008, 10, 2247-2250
3a R = H (89%)3b R = CH3 (87%)
CO CH3
SiCl4, EtOH
R
H
R
H
R
HR
H
2a R = H, 2b R = CH3
![Page 27: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/27.jpg)
Functionalization of Cyclotrimers1 of 2
Dash, B. P.; Satapathy, R.; Maguire, J. A.; Hosmane, N.S. Org. Lett.2008, 10, 2247-2250
1) n-BuLi
3a R = H, 3b R = CH3
R
H
R
H
R
H
R
R'
R
R'
R
R'
2)
4a R = n-C7H15, R' = n-C7H15 (85%)4b R = CH3, R' = n-C7H15 (91%)
I
![Page 28: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/28.jpg)
Functionalization of Cyclotrimers2 of 2
Dash, B. P.; Satapathy, R.; Maguire, J. A.; Hosmane, N.S. Org. Lett.2008, 10, 2247-2250
3a R = H
R
H
R
H
R
H
Si
Si
Si
Si
Si
Si
SiCl2
1) 2 n-BuLi
2)
![Page 29: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/29.jpg)
Convergent Approach
I
2 n-BuLi
2
AlCl3
CH2Cl2, 50 oC
C
O
CH3Br
CO CH3
R = R' = n-C7H15 (92%)
83 %
71%
RR'
RR'
RR'
SiCl4, EtOH
Unpublished Results
![Page 30: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/30.jpg)
Metallacarboranes (1 of 3)
Unpublished Results
Water Soluble
H
H
H
H
H
H
MOH, MeOH
Reflux
HH
HH
HH
M+
M+M+
M = K; Na
HH
HH
HH
+NHMe3
+NHMe3+NHMe3
+NHMe3Cl-
Water Insoluble
![Page 31: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/31.jpg)
Metallacarboranes (2 of 3)
HH
HH
HH
M+
M+M+
SnCl2; THF
M = K; Na = Sn
Unpublished Results
![Page 32: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/32.jpg)
Metallacarboranes (3 of 3)
Unpublished Results
H
H
H
H
H
H
CsF, EtOH
Ref lux
HH
HH
HH
Cs+
Cs+Cs+
![Page 33: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/33.jpg)
Synthesis of C-Fused Polyaromatic Compounds
IBr
CH3n-BuLi,DME
CH3I
CH3
CO
CH3
BHO
HO
PdCl2 (PPh3)2,K2CO3, H2O, Ref lux C
O
CH3
SiCl4
Ethanol, Toluene
CH3
CH3 H3C
73 %
91 %
83 %
Unpublished Results
![Page 34: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/34.jpg)
B-Fused Vs. C-Fused
HH
HH
HH
CH3
CH3 H3C
CH3
CH3
CH3
![Page 35: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/35.jpg)
Conclusions
• Polyhedral Carborane Clusters are useful building blocks in materials chemistry
• Acetyl aromatic moiety attached to the boron atom as well as carbon atoms of the carborane cages undergo trimerization reactions to generate Carborane–containing symmetric building blocks. – Synthesis of higher order dendrimers and liquid crystalline
substances, – Metallacarboranes and new BNCT agents.
![Page 36: Silicon Tetrachloride Promoted Cyclotrimerization Reactions: New Route to Carbosilane Dendrons Barada Prasanna Dash, Rashmirekha Satapathy, John A. Maguire.](https://reader035.fdocuments.net/reader035/viewer/2022062321/56649e2a5503460f94b18396/html5/thumbnails/36.jpg)
Acknowledgments
• Prof. Hosmane (Research Advisor)• Dr Chong Zheng (For Crystal Structure)• Dr Rashmi, Dr Matt, Dr Vladimir, Sumathy, Patrick,
Sonam, Sunitha, Sri Harsha, Anila• National Science Foundation• Robert A Welch Foundation• Northern Illinois University