MOLECULAR STRUCTURE OF ORGANOSILICON COMPOUNDS WITH Si-M (M = Ge, Sn, Pb, Ti, Zr, Hf) BONDS

Abstract

The results of the structural investigations of the group 4 metal derivatives containing direct Si-Ge, Si-Sn, Si-Pb, Si-Ti, Si-Zr, Si-Hf bonds are summarized in the present review. IntroductionRecently we have published a comprehensive survey of data on the molecular structure of organosilicon compounds with silicon-silicon bonds [1], as a part of the structural investigations related to the silyl derivatives of the group 4 elements with Si-M bonds. Herein, we present a review concerning the molecular structure of germanium, tin, lead, titanium, zirconium, hafnium derivatives bearing silyl substituents at the metal atoms. Only a few structures with direct Si-M (M=Ge, Sn, Pb, Ti, Zr, Hf) bonds were studied 10 years ago. Now the interest in this area is becoming increasingly prominent and exciting progress has been made in the chemistry and structural characterization of silyl derivatives of group 4 metals.

A Simple and General Platform for Generating Stereochemically Complex Polyene Frameworks by Iterative Cross‐Coupling

“…Although 6 is fully compatible with silica gel chromatography, this highly versatile [10] new building block can also be conveniently isolated in excellent purity by recrystallization. One-pot hydrostannylation [14] of 6 followed by iododestannylation of the resulting bis-metalated intermediate provided an excellent yield of (E)-1. Alternatively subjecting 6 to a series of silver-promoted alkyne iodination [12] followed by PADC-mediated semireduction [13] provided the complementary building block (Z)-1.…”

“…A synthesis of (E)-2 has been previously reported, [6] but a stereocontrolled route to (Z)-2 was unknown. [14] As shown in Scheme 4, hybridizing methodology previously reported for the germylstannylation of substituted alkynes [15] and the silylstannylation of acetylene, [16] core building block (Z)-2 was efficiently prepared as a single stereoisomer by the palladium-mediated cis-germylstannylation of acetylene gas.…”