Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Abstract The liquid-phase oxidation of p-methoxy toluene to p-anisaldehyde in the presence of Co based catalysts has been studied. With Co(OAc)2 alone in acetic acid as a solvent, only a trace amount of p-anisaldehyde could be obtained; however, upon the addition of a second metal salt (e.g., Mn(OAc)2 or Ce(OAc)3) a considerable improvement in the yield (up to 60%) was observed. The synergism of Co and the second component as well as the optimization of the reaction conditions were investigated. Co(OAc)2–Ce(OAc)3–Cr(OAc)3 (3:1:2) was finally found to be the most effective catalytic system, which gave a 76% yield of p-anisaldehyde under 3 atm O2 at 110° for 3 h.
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
During gravitropism, the directional signal of gravity is perceived by gravity-sensing cells called statocytes, leading to asymmetric distribution of auxin in the responding organs. To identify the genes involved in gravity signaling in statocytes, we performed transcriptome analyses of statocyte-deficient Arabidopsis thaliana mutants and found two candidates from the LAZY1 family, AtLAZY1/LAZY1-LIKE1 (LZY1) and AtDRO3/AtNGR1/LZY2 We showed that LZY1, LZY2, and a paralog AtDRO1/AtNGR2/LZY3 are redundantly involved in gravitropism of the inflorescence stem, hypocotyl, and root. Mutations of LZY genes affected early processes in gravity signal transduction without affecting amyloplast sedimentation. Statocyte-specific expression of LZY genes rescued the mutant phenotype, suggesting that LZY genes mediate gravity signaling in statocytes downstream of amyloplast displacement, leading to the generation of asymmetric auxin distribution in gravity-responding organs. We also found that lzy mutations reversed the growth angle of lateral branches and roots. Moreover, expression of the conserved C-terminal region of LZY proteins also reversed the growth direction of primary roots in the lzy mutant background. In lateral root tips of lzy multiple mutants, asymmetric distribution of PIN3 and auxin response were reversed, suggesting that LZY genes regulate the direction of polar auxin transport in response to gravity through the control of asymmetric PIN3 expression in the root cap columella.
One-pot transformation of 3-methyl-2-(2-oxo-4-phenylsulfonylthio-1-azetidinyl)-2,4-pentadienoates 8, derived from penicillins, into 2-exo-methylenecephems 1 has been achieved by successive treatment with sodium benzenesulfinate and 1,8-diazabicyclo[5.4.0] undec-7-ene (DBU) in dimethylformamide.
Abstract The pro-S group of two enantiotopic carbonyl groups in cis-2,7-decalindione was preferentially reduced with Rhodotorula rubra to give (−)-(7S,9R,10S)-7-hydroxy-cis-2-decalone of high optical purity.
