Organosubstituierte 1,6,2,5-Azoniathiasilaboratabicyclo[3.3.0]oct-3-ene - Herstellung und Kristallstruktur / Organosubstituted 1,6,2,5-A zoniathiasilaboratabicyclo[3.3.0]oct-3-enes - Preparation and Crystal Structure

Abstract

The heterocycles Et [R3 = Me: A; R3 = C(Me)=CH2: B] react with 2-aminoethanethiol (1) by elimination of MeNH2 to give the monocyclic [R = Me: 3a; R = C(Me)=CH2: 3b] and the thermically more stable bicyclic compounds [R = Me: 4a; R = C(Me)=CH2: 4b], 4a crystallizes in the monoclinic space group P21/c [lattice constants (at 120 K) a = 9.3239(10), b = 8.9225(11), c = 17.3958(23) Å; β = 92.207(9)°] with a folded bicyclic ring system. cis-ClB(Et)C=C(Me)Si(Me2)Cl (C) and Na2-1BEt3 (prepared from 1 and NaHBEt3) form by elimination of MeNH2 preferentially 3a and minor amounts of 4a. A reacts with o-aminothiophenol (2) via (5) to (6) and the products 7-10.