2,2 -6w-

All analytical and test samples were recrystd from either acet-n-hexane mixts or acetonitrile and dried in an Abderhalden drying app over refluxing nitrobenzene for at least 4 hours. The product was identified as 2,2,2,f,4,4/,4, 6,6,6w-nonanitroter-phenyl by elemental analysis and X-ray molecular wt detn ... 

AIN is better described as an isolator due to its large direct bandgap of 6.28 eV. Its high melting point (3000°C) and high thermal conductivity (2.6W/cm/K) renders AIN an useful material for high power applications. 

Oxalyl-6w[(trifluoromethanesulfonyl)imino]ethylene-toCN-methylpyridinium) trifluoromethanesulfonate... 

Photocycloaddition of l,2-6w(trimethylsiloxy)cyclobutene and (445) gave the compound (446), which was reduced with NaBH4, hydrolyzed and cleaved oxidatively to afford the epimeric product (447)1S1). 

Cyclopentenones (448a) and (448b) underwent photocycloaddition with 1,2-6w[trimethylsiloxy]cyclopentene to give the epimeric (449a) and (449b) in 65 % and... 

A similar result was reported by Vandewalle 150-151) Irradiation of l,2-6w(tri-methylsiloxy)cyclobutene and compounds (441) afforded compounds (442), which were reduced with LiAlH4 to give the endo alcohol (443). Treatment of the alcohol (443) with methanol for 24 hours would bring about silylether cleavage as well as unexpected direct oxidation of (443) to the cw-hydrindanes (444) in 50-70% yield (Table 18) 150>. 

Tetramethylsuccinonitrilc can be prepared from 2,2 -azo-6w-isobutyronitrilc in a similar manner.2 In this case petroleum... 

An analogous system involved the condensation of pentane-2,4-dione (127) with 6,6 -6w(jV-methylhydrazino)-2,2 -dipyridine (126) in the presence of nickel(II) to generate the thirteen-membered complex 128. Treatment of the complex with sodium cyanide does not release the ligand, nor does the complex form when copper is used as the metal template U0). 

A chiral [4]pseudocatenane 16 was synthesized from chiral triptycene-based m(crown ether) and three equivalents of 6js[p-(but-3-enyloxy)benzyl]ammonium salt in CH2CI2 in the presence of Grubbs II catalyst, followed by reduction <06CEJ5603>. Several novel calix[4]arenocrowns were prepared by a simple one-pot reaction of calix[4]monohydroquinone diacetate with ifr-tosylates, e.g. l,4-Z)w[2-(2-(2-(2-tosyloxy-ethoxy)ethoxy)ethoxy)ethoxy)benzene, in dry MeCN in the presence of NaOH the self-assembly into calix[4]areno[2]catenanes with a dicationic salt and /7-6w(bromomethyl)-benzene was also demonstrated <06TL6012>. 

Little is known about the overall mechanism of cyclic oligomer formation, although the mechanism of the initial stages of the sequence seems fairly clear. The first chemical event is the reaction of formaldehyde (formed in the Petrolite procedures by depolymerization of paraformaldehyde) with phenol to form 2-hydroxy-methyl- and 2,6-6w(hydroxymethyl)phenols in a base-catalyzed process, as shown in Fig. 3. Such compounds were characterized many years ago50), obtained from the action of aqueous formaldehyde on phenol in basic solution at room temperature. Subsequent condensation between the hydroxymethylphenols and the starting phenol occurs to form linear dimers, trimers, tetramers, etc. via a pathway that might involve o-quinonemethide intermediates which react with phenolate ions in a Michael-like reaction, as portrayed in Fig. 4. The condensation of hydroxymethyl-... 

The metal-free condensation of fr(2-formylphenyl)telluride with a series of diamines afforded the macrocyclic tellurium Schiff base macrocycles attempted complexation with Pt(II) and Hg(II) afforded transmetalated products <04JOM1452>. Reduction of the Schiff base components of these chalcogenaza macrocycles gave rise to more robust and flexible macrocycles, which form the desired Pd(II) Tie,iV,jV, Tie-complex <04CC322>. The related Se-derivatives are also therein reported. 5,10-Diphenyl-15,20-di(4-methoxyphenyl)-21-tellura-porphyrin was prepared (18%) by the acid-catalyzed condensation of 2,5-6w(l-phenyl-l-hydroxymethyl)tellurophene, pyrrole, and 4-methoxybenzaldehyde, followed by oxidation with /j-chloranil <04OM4513>. 

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