SYNTHESIS AND CHARACTERIZATION OF A NEW ALKENYLDECABORANE AND ALKENYLMONOCARBON CARBORANES

Decaborane(14) reacts with 1-(CH3)(3)SiC=CC4H9 in the presence of dime thyl sulfide to give the new alkenyl-decaborane 5-(S(CH3)(2))-6-[(CH3) (3)Si(C4H9)C=CH]B10H11 (I). Crystal data for 5-(S(CH3)(2))-6-[(CH3)(3) Si(C4H9)C=CH]B10H11: space group P2(1)/n, monoclinic, a = 9.471(1) Ang strom, b = 13.947(3) Angstrom, c = 17.678(3) Angstrom, beta = 100.32(1 )degrees. A total of 3366 unique reflections were collected over the r ange 2.0 degrees less than or equal to 2 theta less than or equal to 5 6.0 degrees, of which 1763 reflections had F-o(2) greater than or equa l to 3 sigma(F-o(2)) and were used in the final refinement. R(F) = 0.0 83; R(WF) = 0.094. The single-crystal X-ray structure of 5-(S(CH3)(2)) -6-[((CH3)(3)Si)(2)C=CH]B10H11 (A) is also reported. Crystal data for 5-(S(CH3)(2))-6-[((CH3)(3)Si)(2)C=CH]B10H11: space group, P2(1)2(1)2(1 ), orthorhombic, a = 9.059 (3) Angstrom, b = 12.193(4) Angstrom, c = 2 1.431(3) Angstrom. A total of 4836 unique reflections were collected o ver the range 6 degrees less than or equal to 2 theta less than or equ al to 140 degrees, of which 3705 reflections had F-o(2) greater than o r equal to 3 sigma(F-o(2)) and were used in the final refinement. R(F) = 0.052; R(WF) = 0.059. The reactions of 5-(S(CH3)(2))6-[(CH3)(3)Si(C 4H9)C=CH]B10H11 and 5-(S(CH3)(2))6-[((CH3)(3)Si)(2)C=CH]B10H11 with a variety of alkyl isocyanides were investigated. All of the alkenyl mon ocarbon carboranes reported are the result of incorporation of the car bon atom from the isocyanide into the alkenyldecaborane framework and reduction of N=C bond to a N-C single bond. The characterization of th ese compounds is based on H-1 and B-11 NMR data, IR spectroscopy, and mass spectrometry.