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The diazaborole Me 3 Sn–B{N(Dipp)CH} 2  ( 1 ; B{N(Dipp)CH} 2 = N , N ′-bis(2,6-diisopropylphenyl)-2,3-dihydro- 1H -1,3,2-diazaborolyl) was prepared by the reaction of Me 3 SnCl with one equivalent of Li[B{N(Dipp)CH} 2 ]. Single crystals of  1  were obtained from hexane (triclinic space group  P 1̅). The diazaborole  1  was mono-deprotonated at the heterocycle upon treatment with Li[Me] to give product  2 . In contrast to Li[B{N(Dipp)CH} 2 ] which reacted with P 4  to give the tetraphosphenediide Li 2 [{HC(Dipp)N} 2 B–P(1)P(2)P(3)P(4)–B{N(Dipp)CH} 2 ] ( 3 ;  δ  P =364.5, –29.4;  1  J  P(2),P(3) =–509.8 Hz,  1  J  P(1),P(2) =–434.3 Hz,  2  J  P(1),P(3) =–3.7 Hz,  3  J  P(1),P(4) =178.9 Hz) and the triphosphenide Li[{HC(Dipp)N} 2 B–PPP–B{N(Dipp)CH} 2 ] ( δ  P =665.1, 175.4;  1  J  P,P =500 Hz), the stannyl derivative  1  did not activate white phosphorus. The reaction of  1  with GaCl 3  yielded either Me 2 ClSn–B{N(Dipp)CH} 2  ( 4 ) or MeCl 2 Sn–B{N(Dipp)CH} 2  ( 5 ) depending on the molar ratio of the reactants. The monochlorinated diazaborole Me 2 ClSn–B{N(Dipp)CH} 2  was also obtained by the reaction of  1  with AsCl 3 .

Synthesis and properties of 1,3-Bis(2,6-diisopropylphenyl)-2-(trimethylstannyl)- 2,3-dihydro-1 H -1,3,2-diazaborole