AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Protonation of mixtures of [NEt 4 ] [Mo(≡CC 6 H 4 Me-4) (CO){P(OMe) 3 }(η-C 2 B 9 H 9 Me 2 )] and [W(≡CR)-(CO) 2 (η-C 5 R' 5 )] (R=C 6 H 4 Me-4 or Me, R'=H; R=C 6 H 4 Me-4, R'=Me) with HBF 4 .Et 2 O in CH 2 Cl 2 at -78 o C affords the mononuclear tungsten complexes

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Reactions of [Y][closo-1,2-Me 2 -3-(≡CR)-3,3-(CO) 2 -3,1,2-WC 2 B 9 H 9 ] (Y=NEt 4 , N(PPh 3 ) 2 , PPh 4 ; R=Me,C 6 H 4 Me-4) with aqueous HX (X=Cl, I) afforded the salts [Y][closo-1,8-Me 2 -11-(CH 2 R)-2-X-2,2,2-(CO) 3 -2,1,8-WC 2 B 9 H 8 ]; the structure of the product with X=Cl, Y=NEt 4 , and R=C 6 H 4 Me-4 has been established by X-ray diffraction

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Treatment of the compounds [MoW(mu-CC6H4Me-4)(CO)2(eta-7-C7H7) (eta-5-C2B9H10R)] (R = H or Me) in CH2Cl2 with PHPh2 affords the complexes [MoW(mu-PPh2){mu-C(OH)C(C6H4Me-4)}(CO)(eta-7-C7H7)(eta-5-C2B9H10R)]. The structure of the species with R = H was established by X-ray diffraction. The Mo-W bond [2.713(1) angstrom] is spanned by the PPh2 group [Mo-P 2.439(3), W-P 2.360(3) angstrom], and in a transverse manner by the alkyne. However, the latter is twisted so that the C(OH) atom lies appreciably closer to the tungsten [mu-C-W 2.067(8) angstrom] than the molybdenum [mu-C-Mo 2.352(8) angstrom], whereas the C(C6H4Me-4) atom is essentially symmetrically bridging [mu-C-Mo 2.224(9), mu-C-W 2.251(8) angstrom]. The molybdenum atom carries the eta-7-C7H7 group (C-Mo av. 2.27 angstrom), and the tungsten atom is eta-5 co-ordinated by the C2B9H11 cage and a CO group. The reaction between [MoW(mu-CC6H4Me-4)(CO)3(eta-5-C9H7)(eta-5-C2B9H9Me2)] and PHPh2 in CH2Cl2 gives the complex [MoW(mu-CC6H4Me-4)(CO)2(PHPh2)(eta-5-C9H7)(eta-5-C2B9H9Me2)]. The latter on heating in toluene at 70-degrees-C yields the compound [MoW(mu-PPh2)(CO)3(eta-5-C9H7){eta-5-C2B9H8(CH2C6H4Me-4) Me2}], the structure of which was established by X-ray diffraction. The Mo-W bond [2.708(1) angstrom] is bridged by the PPh2 group [Mo-P 2.357(2), W-P 2.456(2) angstrom]. The tungsten atom is ligated by two CO groups, and eta-5 co-ordinated by the C2B9 cage. In the open face of the latter a BH group in the alpha position to a CMe fragment forms a B-H-half-arrow-pointing-right-Mo exopolyhedral bond, while the boron atom beta to the CMe groups in the pentagonal ring carries a CH2C6H4Me-4 substituent. The molybdenum atom is ligated by a CO molecule and the indenyl group. The n.m.r. data (H-1, C-13-{H-1}, B-11-{H-1}, and P-31-{H-1}) for the new compounds are reported and discussed.