2/ in acetone

The tetrahydropyranyl ether, prepared from a phenol and dihydropyran (HCl/EtOAc, 25°, 24 h) is cleaved by aqueous oxalic acid (MeOH, 50-90°, 1-2 h). Tonsil, Mexican Bentonite earth, HSZ Zeolite, and H3[PW,204o] have also been used for the tetrahydropyranylation of phenols. The use of [Ru(ACN)3(triphos)](OTf)2 in acetone selectively removes the THP group from a phenol in the presence of an alkyl THP group. Ketals of acetophenones are also cleaved. ... 

With Pd(dba)2 in acetone/dichloromethane (1 1) and ethene (6-8 atm), styrene is formed from benzenediazonium tetrafluoroborate in 51% yield with seven substituted benzenediazonium salts the yields were 62-75%, but very small yields were obtained with the 2,4,6-trimethyl and the 2- and 4-nitro derivatives (Kikukawa et al., 1979). The two nitrodiazonium salts are good substrates in the Meerwein reaction... 

The 8-coordinate species [Mo(Et2dtc)4] can be obtained by reaction of Mo(CO)e with tetraethylthiuram disulfide (1 2) in acetone under N2. The X-ray structure revealed square-antiprismatic coordination, with a crystallographic, twofold axis coinciding with the molecular pseudo 4 axis (158). The magnetism and spectra of [M(dtc)4]"" (M = Mo or W n = 0 or 1) have been interpreted in terms of dodecahedral symmetry (159). 

A polarographic study of [Ni(sacsac)2] in acetone shows the complex to have a well-defined capacity to accept electrons in a reversible stepwise manner, and the magnitude of the potentials and their reversibility suggests that... 

Mori et al. have now synthesized the cfs-verbenols [(32) and its enantiomer] in optically pure state using essentially the same route as used for frans-verbenol (Vol. 7, p. 41) in connection with optical purity and stereochemical comparisons based upon optical rotations, it is of interest to note that optically pure (32) has [a]o = —9.8° in chloroform and [a]o = +11.4° in methanol and +6.2° in acetone, emphasizing the value of using chiral designations." ... 

During a preparation of the complex [Ni(NCS)2 P(CH2CH2CN)3 2] in acetone solution, a yellow-orange compound was obtained which was characterized as [Ni(C6H1202)2][Ni(NCS)4- P(CH2CH2CN)3 2] (152) (Cdiacetone alcohol ). This reaction, which involves an aldol condensation of two acetone molecules, was found to be not reproducible. 11858,1185b... 

NiL](C104)2 D Template synthesis Ni(en)3(C104)2 + Ni(tmd)3(C104)2 in acetone at room temperature SqPl yellow-orange... 

By varying the ratios of Pd(CNMe) with respect to [Pd(CNMe)4]2+ or by adding Pd(CNMe) to [Pd2(CNMe)6]2+ in acetone solution, the linear trimer [Pd3(CNMe)g](PF6)2 is formed (144). 

Stang and coworkers found that the interaction of bis[4-(4 -pyridyl)phenyl]-A3-iodane 146 with cis-(Et3P)2Pd(OTi)2 in acetone at room temperature results in hybrid A3-iodane-Pd tetranuclear macrocyclic square 147 via self-assembly [Eq. (118)] [227]. Its X-ray structure shows a planar rhomboid-like geometry rather than a perfect square. 

In acetone-dg, r-values of protons indicated in formula, numbers in parentheses correspond to free ligand. 

Table 19 Activation Parameters for Loss of Acetonitrile from fra/ts-[FeL(MeCN)2]2+ in Acetone...

Finally it may be noted that the Ir analogue of [Rh(CO)2(/A-Cl)]2 has been obtained only in solution by carbonylation of [IrClcyclooctene]2 in acetone or MeCN. Evaporation of the blue solutions gives an amorphous polymer [Ir(CO)2Cl] that dissolves only in donor solvents to re-form the dimer. It is a convenient source for making [Ir(CO)2Cl2] and Ir(CO)2(acac).21... 

The cleavage of acetals usually involves acidic conditions, incompatible with acid-sensitive substrates. [Ru(TRIPHOS)(MeCN)3][OTf]2 (2) in acetone offers a solution... 

A woman developed an itchy brownish patch on the right upper arm, in the same place where she had previously been sensitized by dinitrochlorobenzene 2% in acetone (2). A diagnosis of lymphadenosis benigna cutis was made. 

Thin layer chromatography is also used for direct enantiomeric resolution of D,L-arginine, D,L-histidine, d,l-lysine, D,L-valine, and D,L-leucine on silica gel plates impregnated with optically pure (IR, 3R, 5R)-2-azabicy-clo[3,3,0]octan-3-carboxylic acid, which serves as a chiral selector in the pharmaceutical industry. To successfully resolve D,L-amino acids, various combinations of aceto-nitrile-methanol-water were proposed. The spot was detected by ninhydrin (0.2% in acetone). 

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