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The reaction of (phenylacetylenyl)triethoxygermane, (EtO) 3 GeC≡CPh (3), with bromine in CHCl 3 /CCl 4  solution leads to a mixture of Z- and E- (EtO) 3 GeC(Br)=C(Br)Ph (4) in the ratio Z/E = 3/1. Treatment of this product with N(CH 2 CH 2 OH)3 affords a mixture of Z- and EN(CH 2 CH 2 O) 3 GeC(Br)=C(Br)Ph (2) in high yield. Compound E-2 was isolated in 16% yield. The molecular composition and the structure of all new compounds have been established by elemental analyses,  1 H and  13 C NMR spectroscopy. The crystal structure of E-2 is reported. The possible reasons for the different Z/E ratios in the products of the bromination of 3 and N(CH 2 CH 2 O) 3 GeC≡CPh (1) are discussed using DFT calculations.

Synthesis and Crystal Structure of the Germatrane E-N(CH) 2 CH 2 O 3 GeC(Br)=C(Br)Ph