Treatment of [(C3H5)3P]3Pt with BCls affords [(C6H6)3P]3Pt•2BCls whereas [(CeHsLPLPt affords [(CeH5)3P]3Pt•2BCl3 and (CSH5)3P-BC13. Reaction of [(C6H5)3P]3Pt-2BCl3 with pyridine (py) yields py-BCl3 while pyrolysis of the adduct affords benzene. Treatment of [(C6H5)3P]2Pt'SiF4 with BC13 yields [(CeHslsPLPt'BCla whereas reaction with [A1(CH3)3L affords a paramagnetic Pt species and mixed fluoromethylsilanes. Reaction of [(C6H3)3Pj3Pt with [A1(CH3)3]2 results in the formation of [(CeHsLPLPt •2 1( 3)3 which readily decomposes in solution to yield two weakly paramagnetic species. One radical is associáted with Pt and the other with Al.3050 vw 1178 m 935 w 614 w 1582 w 1156 m, sh 840 w 539 vw 1570 vw 1092 s 750 s, sh 508 vs ("X" sensitive) 740 s 450 vw 1474 m 1024 w 704 s, sh 420 vw 1430 m 997 w 687 vs, b 1304 vw 970 vw

the triplet observed for 0(CH2)4NH'BH2CN, shows multiple resonance which is not readily resolved. Future proposals of models for the mechanism of cyanoborane-amine formation by the reaction of cyanotrihydroborate with amine salts must accomodate this hydrogen exchange.

Treatment of tris(triphenylphosphine)platinum(0) with silicon tetrafluoride affords the Lewis salt bis(triphenylphosphine)platinum(0)-silicon tetrafluoride, [(CeHshPLPt'SiFj (I). The reactions of compound I with I2, HC1, and NH3 are discussed. The pyrolysis of I is compared to that of .[(CeHslsPJsPt with both complexes affording benzene and a nonvolatile platinum species which exhibits an esr signal, g = 2.014. A new SiF5~salt, triphenylmethylphosphonium pentafluorosilicate, has been prepared and the chemistry of SiF5_ salts is discussed and compared to that of I.

The basicity of the dimethylamino group in H2[(CH3)2N]B3N3H3 has been investigated. The simple adduct H2[(CH3)2N• BH3]B3N3H3, prepared by the reaction of H2[(CH3)2N]BáN3H3 with B2He, has been characterized according to its infrared and and 11B nmr spectra. The compound is stable at room temperature in the presence of excess B2H6 but reacts with B2H6 if diethyl ether is present. The products of this reaction are H3B3N3H3 and ju-(CH3)2NB2H5. The relative basicity of H2[(CH3),N]B3N3H3 has been determined by studying a series of competition reactions with other bases using B2H6 as the reference acid. The observed order of base strength is C6H5NThese results indicate that the electrons of borazine are partially delocalized and have a significant influence on the chemical properties of a ring substituent.

Die Titelverbindung (I) wird durch Reaktion des Tris‐[phosphin]‐Pt‐Komplexes mit SiF4 in Benzol bei Raumtemperatur erhalten und durch IR‐ und NMR‐Spektraldaten charakterisiert.