A synthesis of moracin M using Appel dehydration a biomimetic inspired endoperoxide and subsequent late stage aromatization, is described. key 1,3-diene, obtained from base-free Suzuki-Miyaura coupling, can undergo oxidation to its endoperoxide, followed by under conditions aromatization give benzofuran, with deprotection then providing in only 4-steps. Alternatively, this 1,3‑diene synthetic r...

The monoclinic title complex, [PtI(2)(C(8)H(12))], characterized by a twisted cyclo-octa-diene ring, is similar to its Cl and Br ortho-rhom-bic homologues. The observed Pt-I bond distances of 2.6094 (5) and 2.6130 (5) Å are in the expected range for PtI(2) complexes. The C=C double bonds in the mol-ecule differ significantly [1.373 (10) and 1.403 (10) Å]. As expected for a platinum(II) complex,...

DNA hybrid catalysis goes organometallic: A DNA strand functionalized with diene ligands forms iridium(I) complexes that can efficiently catalyze an allylic amination in aqueous medium (see scheme). The DNA-based complexes show high stability and activity, and their secondary structure influences the stereoselectivity of the reaction.

In this contribution, we disclose the ability of α,ω-diene comonomers, namely 1,7-octadiene and 1–10-undecadiene, as long-chain branching (LCB)/cross-linking promoters in ethylene polymerization catalyzed by bis(indenyl) bis(cyclopentadienyl) catalyst systems, rac-{EBTHI}ZrCl2 (Zr-1) (nBuCp)2ZrCl2 (Zr-2). Both under homogeneous heterogeneous (slurry) conditions, Zr-1-based systems efficiently p...

because of the importance of microbial metabolites of cholesterol as precursors in the synthesis of steroidal drugs, we decided to study the ability of arthrobacter simplex to degrade cholesterol. arthrobacter simplex cleaves the side chain of cholesterol in the presence of 2,2'-dipyridyl and produces 4-androstene-3,17- dione (ad) and androsta- 1,4-diene-3,17-dione(add). two other intermed...

Three novel multiflorane-type triterpenoids, 3α-p-nitrobenzoylmultiflora-7:9(11)-diene-29-benzoate (1), 3α-acetoxymultiflora-7:9(11)-diene-29-benzoate (2), and 3α-acetoxymultiflora-5(6):7:9(11)-triene-29-benzoate (3), along with two known related compounds 4 and 5 were isolated from the seeds of zucchini (Cucurbita pepo L). Their structures were determined on the basis of 1D and 2D NMR spectros...

A chemical analysis of the diterpene hydrocarbons produced by fusicoccin-producing fungus Phomopsis amygdali F6 identified five phyllocladene-related tri- and tetracyclic diterpene hydrocarbons. The presence of (+)-phyllocladene, (--)-sandaracopimaradiene, (+)-isopimara-8,15-diene, and (+)-pimara-8(14),15-diene in the fungus was demonstrated by GC-MS, 1H-NMR, and [alpha]D measurements. (+)-Kaur...

A phytochemical investigation of the CHCl (3)-soluble extract of the entire plant of Egletes viscosa (Asteraceae), collected in Peru, afforded two new labdane glycosides, 13-hydroxy-7-oxolabda-8,14-diene 13( R)- O-alpha- L-arabinopyranoside and 13-hydroxylabda-7,14-diene 13( R)- O-alpha- L-arabinopyranoside, along with four known compounds. The structures of the new compounds were elucidated by...

The title complex, [Rh(C(20)H(15)N(2)OS)(C(8)H(12))], exhibits an essentially square-planar coordination environment around the Rh(I) atom, which bears a bidentate cyclo-octa-diene ligand as well as a monoanionic bidentate benzoyl-thio-ureate ligand. The Rh(I) atom, the S- and O-donor atoms and the alkene centroids of the cyclo-octa-diene ligand do not deviate by more than 0.031 Å from their le...

Ab initio G2M(MP2)//B3LYP/6-311G** calculations have been performed to investigate the reaction mechanism of photodissociation of buta-1,2- and -1,3-dienes and but-2-yne after their internal conversion into the vibrationally hot ground electronic state. The detailed study of the potential-energy surface was followed by microcanonical RRKM calculations of energy-dependent rate constants for indi...