Metallacyclic complex [(Me2N)(3)Ta((2)-CH2SiMe2NSiMe3)] (3) undergoes CH activation in its reaction with H3SiPh to afford a Ta/-alkylidene/hydride complex, [(Me2N)(2){(Me3Si)(2)N}Ta(-H)(2)(-C-(2)-CHSiMe2NSiMe3)Ta(NMe2)(2)] (4). Deuterium-labeling studies with [D-3]SiPh show H-D exchange between the TaDTa unit and all methyl groups in [(Me2N)(2){(Me3Si)(2)N}Ta(-D)(2)(-C-(2)-CHSiMe2NSiMe3)Ta(NMe2)(2)] ([D-2]-4) to give the partially deuterated complex [D-n]-4. In addition, 4 undergoes -H abstraction between a hydride and an NMe2 ligand and forms a new complex [(Me2N){(Me3Si)(2)N}Ta(-H)(-N-(2)-C,N-CH2NMe)(-C-(2)-C,N-CHSiMe2NSiMe3)Ta(NMe2)(2)] (5) with a cyclometalated, (2)-imine ligand. These results indicate that there are two simultaneous processes in [D-n]-4: 1)H-D exchange through sigma-bond metathesis, and 2)HD elimination through -H abstraction (to give [D-n]-5). Both 4 and 5 have been characterized by single-crystal X-ray diffraction studies.

(Me3SiCH2)3(Me3SiC≡)W←O=PMe3 (1), an adduct between (Me3SiCH2)3W≡CSiMe3 (2) and O=PMe3, reacts with O2 to give O=W(OSiMe3)(CH2SiMe3)3 (3) and CO2. Reaction of 2 with H2O yields 3 and the trimer [(μ-O)W(CH2SiMe3)2(=O)(THF)]3 (4). In the reaction of D2O with 2, 3-d(n) and methane isotopologues CH2D2, CHD3 and CD4 have been observed.

L'invention se rapporte a des compositions et a des procedes d'elimination de maniere pratique et efficace d'un materiau de NiPt (1 a 25 %) sur des dispositifs microelectroniques presentant le meme sur ceux-ci. Les compositions sont pratiquement compatibles avec d'autres materiaux presents sur le dispositif microelectronique tels que des materiaux de grilles metalliques.

With <2% of the mass in US landfills, electronic waste (e-waste) accounts for 70% of hazardous materials.Approximately 5% by weight of e-waste consists of valuable secondary resource stock-printed wiring boards (PWBs).Those PWBs with high metal value are sold to overseas smelters and those PWBs with low value are sent to Asia or Africa where the integrated circuits (ICs) are manually desoldered and the trace precious metals are collected either by open burning or from chemical leaching with toxic chemicals such as hot aqua-regia and cyanide, which lead to environmental pollution and human exposure to hazardous chemicals.This paper reports novel cradle-to-cradle PWBs recycling processes and enhanced process efficiencies based on green chemistry and green engineering methodologies for the complete recycling of PWBs.We will describe that one can recover metals and valuable components from end-of-life (EOL) PWBs using cost effective, sustainable, and scalable methods.This includes both chemical desoldering and precious metal reclaim on ATMI's eVOLV TM PWBs recycling line.

Advanced Technology Materials, Inc. (ATMI) has developed a novel process based on green chemistry and green engineering methodologies for reclaiming valuable materials from waste electronics. We have demonstrated that we can recover metals and valuable components from end-of-life products using cost-effective, sustainable, and scalable methods (e.g., systems that are closed-loop, energy efficient and environmentally benign). This includes both chemical desoldering and precious metal reclaim from printed wiring boards (PWBs) and integrated circuits (ICs) near room temperature with all metals recovered and resold. Our current system is processing approximately 400 lbs. per hour of high value printed wiring boards.

A pH neutral formulation 3x to perform the in-line cleaning of resists/topcoats contaminated immersion assembly efficiently and effectively has been developed. It is environmentally benign with no halides, no individual component having a flash point above 38°C or known to cause cancer, birth defects or other reproductive harm.