O Benzaldehyde

Benzaldehyde, o nitro, 46,81 Benzaldehyde, 2,4,6-trimethyl-, 47,1 Benzaldehydes, halogen- and methyl-substituted, preparation from diazomum salts and formal doxime, 46, IS... 

Benzyl- 112, 240, 346, 355 f., 358, 436, 611 ff., 680 aus Benzaldehyd-O-methyl-oxim und Diboran377 aus Benzonitril und Natriumboranat 115 aus O-Benzoyl-benzhydroxamsaure und Lithium-alanat 264... 

A model readion of benzaldehyde, o-methoxy-aniline, and 1-phenyl-l-trimethylsiloxyethene was performed in the presence of 5 mol% of Sc(OTf)3 in... 

It is obtained by condensing benzaldehyde-o-sulfonic acid with 2 equivalents of N-ethylbenzylaniline, followed by sulfonation, oxidation, and conversion to the ammonium salt. The dissolved dye is then immersed in a dispersion of aluminum hydroxide and converted to the corresponding salt using aluminum chloride or barium chloride solution ... 

The reactions of 3-amino-l,2,3-benzotriazin-4(3//)-one and a number of its derivatives (lOla-g) under both acidic and basic media have been investigated in some detail by Gibson and Green. Earlier work by Heller and his colleagues had apparently established that treatment of lOla-e with hot aqueous sodium hydroxide solution gave o-azido-benzoic acid (102), and Gibson and Green showed that lOlf behaved similarly. The benzylidenamino derivative 10 Ig, however, was reported by Heller to yield benzaldehyde o-carboxyphenylhydrazone (103) under basic conditions, and benzimidazolone (104) under acidic conditions. 

Allyl phenyl ether Benzaldehyde o-Cresol m-Toluic acid... 

Oxovanadium(IV) complexes have also been prepared with the carbohydrazones and thiocarbohydrazones formed in the condensation of carbohydrazide or thiocarbohydrazide with benzaldehyde, o-nitrobenzaldehyde, anisaldehyde, cinnamaldehyde, acetophenone and 2-acetylpyridine.845 file values are 1.68-1.72 BM and v(V=0) is at 960-980 cm-1. The compounds, [V0(L)2(H20)j (147), were suggested to be of structure (12) (p. 487).845... 

Pigment Blue 24 [6548-12-5] 42090 1 triarylcarbonium Ba salt (Peacock Blue) condensation of benzaldehyde-o-sulfonic acid with iV-ethyl-N-benzylaniline, followed by sulfonation, oxidation, and salt formation... 

Elimination reactions of (E)- and (Z)-benzaldehyde O-pivaloyloximes (19a) and (19b) with DBU in MeCN have been found to occur by a nitrile-forming E2 mechanism which is ca 2000-fold faster for the latter isomer in each case.15 The corresponding Hammett substituent constants, activation parameters, and primary deuterium isotope effects, suggest that the anti elimination from (19b) (for which p = 2.4 0.1, kH/ku = 2.7 0.3, AH = 12.5 0.2 kcal mol-1, and AS = —31.0 0.6eu) proceeds to (20) via a more symmetrical transition state with a smaller degree of proton transfer, less charge development at the /f-carbon and greater extent of triple bond formation than for syn elimination from (19a) (for which p = 1.4 0.1, kH/kD = 7.8 0.3, AH = 8.8 0.1 kcal mol-1 and AS = -23.6 0.4 eu). 

Component 1 in Singapore buildings was correlated with compounds associated with humans and their activities. Human effluents have been reported to contain isoprene (Ellin et al, 1974) while tetrachloroethylene is a VOC found in dry-cleaned clothes worn by building occupants (Wallace, Pellizzari and Wendel, 1991) or from the use of consumer products (Sack et al., 1992). Tetradecane, benzaldehyde, o-xylene, naphthalene are emissions from dry process photocopiers (Leovic et al., 1996). Component 2 with high loadings ofn-decane, n- undecane, toluene, styrene, n-nonane, 1,2,4-trimethyl benzene probably reflects the emissions of carpets and vinyl floorings (Yu and Crump, 1998). Component 3 was primarily correlated with heptane and methylcyclopentane, which could be due to the emissions of water-based paints. Finally, component 4 was associated with 2-methylpentane, hexane, cyclohexane, methylcyclohexane and limonene, which is reflective of the emissions of air fresheners and cleaning products (Sack et al., 1992). 

The formation and intramolecular dipolar cycloaddition of azomethine ylides formed by carbenoid reaction with C=N bonds has recently been studied by the authors group.84 Treatment of 2-(diazoace-tyl)benzaldehyde O-methyl oxime (176) with rhodium(II) octanoate in the presence of dimethyl acetylenedicarboxylate or N-phenylmaleimide produced cycloadducts 178 and 179, respectively. The cycloaddition was also carried out using p-quinone as the dipolarophile. The major product isolated corresponded to cycloadduct 180. The subsequent reaction of this material with excess acetic anhydride in pyridine afforded diacetate 181 in 67% overall yield from 176. The latter compound incorporates the basic dibenzofa, d -cyclohepten-5,10-imine skeleton found in MK-801,85 which is a selective ligand for brain cyclidine (PCP) receptors that has attracted considerable attention as a potent anticonvulsive and neuro-protective agent.86,87... 

The formation and intramolecular dipolar cycloaddition of azomethine ylides formed by carbenoid reaction with C-N double bonds has recently been studied by the author s group [66]. Treatment of 2-(diazoacetyl)benzaldehyde O-methyl oxime (118) with rhodium (II) octanoate in the presence of dimethyl acetylenedicarboxylate or iV-phenylmaleimide produced cycloadducts 120 and... 

Attempts to reduce benzaldehyde-o-nitrophenylhydrazone to benzaldehyde-o-hydroxylaminophenylhydrazone which on ring closure might form the dihydrobenzotriazine were not successful,70 as it was not possible to avoid the further reduction to amine. A similar situation is also found in the reduction of o-nitroanilines. 

A nice example of the solvent-dependent dual reactivity of an electrophilic crypto-cationic species has been given by Hiinig et al. [663]. Ambident electrophilic a-enones react with nucleophiles such as the anion of the benzaldehyde O-(trimethylsilyl)-cyanohydrin (Nu ) in diethyl ether exclusively by 1,4-addition. In tetrahydrofuran (THF) or 1,2-dimethoxyethane (DME), the 1,2-adduct is formed predominantly on the addition of HMPT or [12]crown-4 it is formed exclusively cf. Eq. (5-133). 

Cyanogen and ca-bromoacetophenone give di-imino-dihydroquimxaline and a phenyl-dihydroquinoxaline respectively. If the diketones are replaced by monocarbonyl compounds such as aldol, crotonie aldehyde, benzaldehyde, o- and p-anisaldehydes or iiiperonal, arsenated Schiff s bases result, e.g. 

---