Synthesis, structure, and reactivity of a polynuclear chromium tetraanion, tetrakis[(.mu.3-methoxo)tricarbonylchromate(0)]

The Chemistry of 1,3,5-Triazacyclohexane Complexes. 6.1Synthesis and Characterization of the Cobalt(II) Methoxide Core {Co3(OMe)4}2+

“…Thus, Me 3 TAC deprotonated some of the coordinated MeOH to form an open methoxo cubane cluster with η 3 -coordinated Me 3 TAC on each cobalt atom. There is no indication that an additional (Me 3 TAC)Co 2+ fragment can be added to complete the cubane cluster although many complete M 4 (OMe) 4 cubanes are known (e.g., refs and ), and construction of a {(Me 3 TAC)Co(OMe)} 4 4+ with the bond lengths and angles found in 2 (see below) does not show any close nonbonded contacts significantly different from those found in 2 . Thus, the complete cubane cluster may not be formed due to the high 4+ charge rather than due to the steric interactions.…”

Bis(tetraethylammonium) oxalate dihydrate

“…For related compounds containing planar and nonplanar oxalate ions, see: Beagley & Small (1964); Robertson (1965); Jeffrey & Parry (1954). For general syntheses of tetraalkylammonium salts and their uses, see: Barthel & Kunz (1988); Heck (1982); Markowitz (1957); McNeese et al (1984); Starks (1971). For uses of [(C 2 H 5 ) 4 N) 2 (C 2 O 4 )]Á2H 2 O, see: Darensbourg et al (1992); Demadis & Coucouvanis (1995); Diop et al (1997); Engels et al (1983).…”

“…Tetraalkylammonium salts are important compounds as phase-transfer catalysts (Starks, 1971), as electrolytes in electrochemical studies (Barthel & Kunz, 1988), in organic Heck-type synthetic reactions (Heck, 1982), and in preparing and isolating polynuclear organometallic complexes (McNeese et al, 1984). A procedure for synthesizing quaternary ammonium salts involves neutralization of a tetraalkylammonium hydroxide with the acid of the desired anion (Markowitz, 1957).…”

Methylzinctert-butoxide tetrahydrofuran solvate

“…1). Such pseudo-cubic tetramers are a common structure type in alkoxide structural chemistry, not only of Group 12 elements (Boersma, 1982;No È th & Thomann, 1995), but also of many main group elements (Lindsell, 1982;Rothfuss et al, 1993;Wright & Beswick, 1995) and transition metals (Geerts et al, 1983;McNeese et al, 1984;Darensbourg et al, 1998). In (I)ÁTHF, the tetrameric aggregates form an approximate facecentred-cubic lattice, with the octahedral sites occupied by positionally disordered THF molecules (Fig.…”