Chungkyun Kim, Younsook Jeong, Inkyung Jung
Nov 10, 1998
Citations
0
Influential Citations
27
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract Synthesis and characterization of dendritic macromolecules using 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (Me(CH 2 CH)SiO) 4 and 1,2-bis(triallyloxysilyl)ethane ((CH 2 CHCH 2 O) 3 SiCH 2 ) 2 as core molecules and allylalcohol/dichloromethylsilane as a building block have been described. The dendrimers containing dichloromethylsilyl-groups ( GS-1P∼GS-4P and GH-1P∼GH-3P ) were produced by the hydrosilation process of double bonds in vinyl and allyloxy-groups in the GS- n and GH-n type dendrimers with dichloromethylsilane in the presence of a platinum catalyst (Pt/C). The GH- n and GS- n type dendrimers containing allyloxysilyl-groups were prepared by the reaction of GH- n P and GS- nP type dendrimers containing Si–Cl bonds and allylalcohol in the presence of TMED at room temperature. The purification of the prepared GH- n and GS- n type dendrimers used simple column chromatography. The yields of the prepared dendrimers have been obtained almost quantitatively. The analyses of the 1 H- and 13 C-NMR, MALDI mass spectra, and elemental analysis made it possible to obtain the pure and unified dendrimers. In additive manner, the molar absorbities of each generation of GH- n and GS- n type dendrimers show increasing character by the increasing number of double bonds.