Molecular structures and reactivities of digermiranes and azadigermiridines

Abstract

gional NMR Facility (Grant No. CHE-79-16324). We also thank Andrea Owyeung for the illustrations. Supplementary Material Available: Tables of positional and thermal parameters and complete interatomic distances and angles for 3-6, 8, 10, and 11 (62 pages); tables of observed and calculated structure factors (81 pages). Ordering information is given on any current masthead page. Tables of crystallographic data for the compounds 4,1 23 Tl[5]-2/3C7H8,7 Tl[6],8 98-V2C6H6,4 [(PPh3)2N][10],5 and Na[ll]6 were supplied with the now-published initial preliminary communications pertaining to these structures.

Azadigermiridines by Addition of Diazomethane or Trimethylsilyldiazomethane to a Digermene1

“…For example, the 2,6-diethylphenyl-substituted digermene 1 reacts with diazomethane to furnish the digermirane 3 , presumably by way of a [2+3] cycloaddition with subsequent elimination of nitrogen. Depending on the reaction conditions, compound 3 is isolated in 72% or even quantitative yield . In contrast, the corresponding reaction of the more voluminously substituted digermene 2 affords the digermirane 4 in only 6% yield .…”

Germanium Organometallic Compounds: Classification and Analysis of Crystallographic and Structural Data

“…The Ge(l)-Ge(2) bond length differs little from that found in Ge^-iv tmtdi)Cl4 (238.0(1) pm) [225], but it is considerably shorter than the corresponding distance in ΰε^μ-η"-tmtdi){(NBu) 2 SiM%} 2 at 245.9(1) pm [238]. There are five digamanium derivatives which contain the Ge,X ring (X = S [223], C or Ν [224], Te [232] or Si [239]). TheGe-Ge bond distance increases in the given ordff from 237.6(2) to 250.5(2) pm.…”

Multiply Bonded Germanium, Tin and Lead Compounds

“…Photolysis of cyclotrigermanes 12 or bis(trialkylsilyl)germanes 21,22 having bulky substituents gives the corresponding digermenes. For examples, digermenes 3 and 4 have been synthesized by these methods (Scheme 3).…”