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

The diazaborole Me3Sn-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 Me3SnCl with one equivalent of Li[B{N(Dipp) CH}2]. Single crystals of 1 were obtained from hexane (triclinic space group P1). The diazaborole 1 was monodeprotonated at the heterocycle upon treatment with Li[Me] to give product 2. In contrast to Li[B{N(Dipp)CH}2] which reacted with P4 to give the tetraphosphenediide Li2[{HC(Dipp)N}2B-P(1)P(2)P(3)P(4)-B{N(Dipp)CH}2] (3; δP = 364.5, -29.4; ¹JP(2),P(3) = -509.8 Hz, ¹JP(1),P(2) = -434.3 Hz, ²JP(1),P(3) = -3.7 Hz, ³JP(1),P(4) = 178.9 Hz) and the triphosphenide Li[{HC(Dipp)N}2B-PPP-B{N(Dipp)CH}2] (δP = 665.1, 175.4; ¹JP,P = 500 Hz), the stannyl derivative 1 did not activate white phosphorus. The reaction of 1 with GaCl3 yielded either Me2ClSn-B{N(Dipp)CH}2 (4) or MeCl2Sn-B{N(Dipp) CH}2 (5) depending on the molar ratio of the reactants. The monochlorinated diazaborole Me2ClSn-B{N(Dipp)CH}2 was also obtained by the reaction of 1 with AsCl3. [ABSTRACT FROM AUTHOR]