Germane tetramethyl

A quite surprising development, even to experienced workers in elemental-fluorine chemistry, has been the synthesis of trifluoromethyl organometallic compounds by direct fluorination of metal alkyls (25). Even more surprising is the fact that, for certain metal and metalloid systems, such as the reaction of elemental fluorine with tetramethyl-germane, this t5rpe of low-temperature synthesis is a practical method 26) for the laboratory preparation of the perfluoro analog. 

Trimethyl-d9-chlorogermane was prepared for an infrared study by reacting tetramethyl-di2-germane with acetyl chloride in the presence of a Lewis acid such as aluminium trichloride12 (equation 11). 

TETRAMETHYLTHIOUREA see TDXOOO TETRAMETHYL-THIRAM DISULFID (GERMAN) see... 

Various photoreactions in which the silicon atom plays a less important role have been reported. The isolation of trans-1,2-diphenyl-4,4,5,5,6,6-hexamethyl-4,5,6-trisilacycloheptene (185), formed by irradiation of the corresponding cis-isomer (186), has been described the stability of this system is attributed to the long silicon-silicon bond lengths.Evidence for the intermediacy of a photochemically generated metastable trans-cycloalkene has also been reported in l,l,4,4-tetramethyl-l,4-disilacyclohept-2-ene. A novel [,2 + 2] photocycloaddition to give the bicycles (187) has been reported in the diallylsilanes (188) in the presence of 1,4,-dicyanonaphthalene. Intramolecular [ 2 + 2] photoaddition has also been observed in bis- and tetrakis-(4-vinyl-benzyl) silanes and their germane analogues,and the oxetanes (189) and (190) have been prepared by irradiation of 1,1-dimethyl-2,5-diphenylsilacyclopentadiene in the presence of benzophenone. 

Tetramethyl pyrophosphite [1, 1138-1139, before references]. A German group4 has used the reagent for cyclization of a peptide by activation of the amino group. The reaction is carried out at 140° with high dilution. 

TETRAMETHYL-THIRAM DISULFID (German) (137-26-8) Combustible sol id (flash... 

Liquid Tetramethylsilane Tetramethyl- germane Neopentane n-Pentane... 

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