Abstract
Addition reactions of the diarylgermylene R2Ge: (R=2-tBu-4,5,6-Me3C6H) and the heteroleptic stannylene RR′Sn: (R′ = Si(SiMe3)3) to the cryptodiborylcarbene (Me3Si)2C(tBuB)2C: furnish the germaethene (Me3Si)2C(tBuB)2C=GeR2 (8) and the stannaethene (Me3Si)2C(tBuB)2C=SnRR′ (12), respectively. The X-ray structure analysis of 8 reveals a twisting of the Ge=C double bond with torsion angles of 33 and 34°. In addition to a slight twisting of the double bond (average torsion angle = 11.9°), compound 12 shows a trans-bending of the substituents with bent angles of 13.2° at the tin and 9.7° at the carbon atom of the Sn=C double bond. © 1999 John Wiley & Sons, Inc. Heteroatom Chem 10:554–558, 1999
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