Mannich bases were prepared from substituted phenols with aliphatic amines and formal­ dehyde. Amine exchange with N-methyl-2-naphthylamine followed by a Hofmann Martius rearrangement gave rise to o,o'-amino-hydroxy-diphenylmethane derivatives. Under cyclization conditions some of these compounds produced spirocyclohexadienones, which are the ipso analogs to the hypothetic intermediates postula...

The first total synthesis of the tetracyclic alkaloid (-)-acutumine is described. Key reactions include an asymmetric ketone allylation mediated by Nakamura's chiral allylzinc reagent, an anionic oxy-Cope rearrangement, and the Lewis acid-promoted cyclization of an amine onto an alpha,beta-unsaturated dimethyl ketal.

Mesoporous silica grafted with a tertiary amine was used as a basic nanocatalyst to promote in confined medium the enantioselective cascade rearrangement of enediynes based on the phenomenon of memory of chirality; the multi-substrates recyclable catalytic reagent could easily be recovered by simple filtration, and reused without any decrease in activity even when changing the solvent.

The combination of palladium catalysis and thermal cycloaddition is shown to transform tricyclic aziridines into complex, stereodefined tetracyclic products in a single step. This highly unusual cascade process involves diverted Tsuji–Trost sequence leading surprisingly facile intramolecular Diels–Alder reaction. starting materials are accessible on multigram scales from the photochemical rearr...

adjutants' ability in enhancing the performance of herbicides is a major priority in adjuvant research. to identify an appropriate adjuvant for pinoxaden and clodinafop propargyl herbicides against littleseed canarygrass (phalaris minor retz.), common wild oat (avena fatua l.) and ryegrass (lolium temulentum l.), three separate experiments were conducted under greenhouse conditions. in all...

Union Carbide Witco Chemical Aerosol 22 Aerosol A-102 Aerosol 18 Aerosol OS Cyanamer P-35 Ethofat 242/25 Ethofat C/15 Ethomid HT/60 Ethomeen 18/60 Merpol DA Zelec DX Duponol ST Merpol F Alkanol S Flakes Duponol WA Dry Duponol WA Paste Duponol WAQ Duponol ME Dry FC-134 FC-170 FC-172 LSD-2 LSD-6 Dequest 2000 Dequest 2006 EMA Grade 11 EMA Grade 61 ID-2721 Lomar PW Nopcosant L Tamol SN Tamol 731-25...

Synthesis of poly(vinyl chloride-g-β-butyrolactone) [poly(VC-g-BL)] graft copolymer was carried out by means “click” chemistry terminally propargyl polyβ-butyrolactone ester (PBL-propargyl) and polyvinyl chloride with pendant azido group (PVC-N3). PVC-N3 synthesized reaction purified PVC sodium azide. PBL-propargyl obtained the β-butyrolactone alcohol ring-opening polymerization. By using PBL-p...

various adjuvants carry out different functions depending on the herbicides types and the target species. outdoor pot experiments were conducted to evaluate the effects of three post-emergence herbicides, namely, clodinafop-propargyl, haloxyfop-p-methyl, and difenzoquat-methyl-sulfate, as influenced by two adjuvants, on wild oat (avena ludoviciana durieu.) control. the study was carried out at ...