✦ LIBER ✦

Stereospecific functionalization of the heterocyclic ring systems of flavan-3-OL and [4,8]-biflavan-3-OL derivatives with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)

✍ Scribed by Jacobus A. Steenkamp; Daneel Ferreira; David G. Roux

Publisher: Elsevier Science
Year: 1985
Tongue: French
Weight: 240 KB
Volume: 26
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)98614-3

No coin nor oath required. For personal study only.

✦ Synopsis

Efficient stereospecific 4-methoxylation of both 2,3-trans-and 2,3cis-flavan-3-01 methyl ethers with 2,3-dichloro-5,6-dicyano-1,4_benzoquinone (DDQ) in CHC13-MeOH solution is of both synthetic and degradative significance in oligomeric flavanoid chemistry.

Oxidative 4-functionalization of the methyl ethers of 2,3-trans-and 2,3-&s-

📜 SIMILAR VOLUMES

ChemInform Abstract: Formation of Adaman

ChemInform Abstract: Formation of Adamantan-1-ols by the Reactions of Adamantanes with 2,3-Dichloro-5,6-dicyano-p-benzoquinone (DDQ) in Trifluoromethanesulfonic Acid.

✍ Kiyoshi Tanemura; Tsuneo Suzuki; Yoko Nishida; Koko Satsumabayashi; Takaaki Hora 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 30 KB 👁 2 views

## 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 v

Reaction of some substituted 2-allylphen

Reaction of some substituted 2-allylphenols with 2,3-dichloro-5, 6-dicyano-1,4-benzoquinone (DDQ) - a new method for the synthesis of coumarins

✍ K.V. Subba Raju; G. Srimannarayana; N.V. Subba Rao 📂 Article 📅 1977 🏛 Elsevier Science 🌐 French ⚖ 234 KB

Several methods are available for the synthesis of coumarin ring systeml. We nQy report a new method for the synthesis of coumarins by oxidative cyclisation of some substituted 2allylphenols by 2,3=dichloro-5,6-dicyano-1,4-bensoguinone 0). 7-Allyloxy-3-methylflavone2 on Claisen rearrangement b vacu

ChemInform Abstract: Oxidation Conversio

ChemInform Abstract: Oxidation Conversion of 3-Alkoxyfurans to 2-Hydroxy-3(2H)-furanones and 2-Hydroxy-2-butene-1,4-diones with 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) or Phenyltrimethylammonium Tribromide (PTAB) in t-BuOH.

✍ Shinsei Sayama 📂 Article 📅 2008 🏛 John Wiley and Sons ⚖ 31 KB 👁 1 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 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 v

Synthesis of the bi-heterocyclic parent

Synthesis of the bi-heterocyclic parent ring system 1,2,4-triazolo[4,3-b][1,2,4,5]tetrazine and some 3,6-disubstituted derivatives

✍ David E. Chavez; Michael A. Hiskey 📂 Article 📅 1998 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 236 KB 👁 1 views

## Abstract The synthesis of the previously unknown parent ring system was developed. Treatment of 3‐hydrazino‐1,2,4,5‐tetrazine (4) with diethoxymethyl acetate gave the parent ring system. Similar treatment of 3‐(3,5‐dimethylpyrazol‐1‐yl)‐6‐hydrazino‐1,2,4,5‐tetrazine (2) with one carbon cyclizing

ChemInform Abstract: Oxidation of 1-Tetr

ChemInform Abstract: Oxidation of 1-Tetralone Oximes with 2,3-Dichloro-5,6-dicyano-1,4- benzoquinone (DDQ) in Non-Aqueous AcOH-Benzene Media: Easy and Efficient Preparation of Naphthoquinone Monooximes.

✍ T. WATANABE; Y. OKU; H. ISHII; T. ISHIKAWA 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 30 KB 👁 1 views

ChemInform Abstract: Asymmetric Reaction

ChemInform Abstract: Asymmetric Reactions of 2-Methoxy-1,4-benzoquinones with Styrenyl Systems: Enantioselective Syntheses of 8-Aryl-3-methoxybicyclo[4.2.0]oct-3-en-2,5-diones, 7-Aryl-3-hydroxybicyclo[3.2.1]oct-3-en-2,8-diones, 2-Aryl-6-methoxy-2,3-dihydrobenzofuran-5-ols, and Pterocarpans.

✍ Thomas A. Engler; Michael A. Letavic; Rajesh Iyengar; Kenneth O. LaTessa; Jayach 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 44 KB 👁 1 views

The chiral titanium complex, derived from TiCl 4 , Ti(O-iPr) 4 , and dioxole (+)-PPD, effectively promotes the enantioselective formation of compounds (III)/(VII) and (V)/(IX) in good yields and high e.e. from (E)-alkene (II) and benzoquinones (I) or (VI). Compounds (IV)/(VIII), which are also forme