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A review with 70 refs. LICKOR mixts. of organolithium reagents and bulky potassium alcoholates allow the smooth metalation and subsequent electrophilic substitution of low acidity hydrocarbons, in particular olefins. The allylpotassium intermediates exhibi ...
Results are presented on 2-D FIR (two-dimensional finite-impulse-response) filter banks for multirate applications. The theory is valid for all sampling lattices; conditions for alias-free and perfect signal reconstruction are derived. Synthesis structures ...
Muscalure (9/tricosene) was prepd. very readily by an instant-ylid reaction of nonanal with Ph3P:CH(CH2)12Me or of (Z)-Me(CH2)7CH:CHCH2OAc with BrMg(CH2)11Me. (Z)-9-Tricosene was formed in a highly selective manner (.apprx.97.5) although it was difficult t ...
Oxirane I, prepd. by epoxidn. of (EtO)2CHCH2CH:CH2, reacted with Grignard reagents in the presence of catalytic CuBr to give 78-92% b-hydroxyacetals (EtO)2CHCH2CHR1OH [II; R1 = CH2CMe3, CH2CHMeEt, pentyl, CH2CH2CMe:CH2, CH2Ph, CH2CH2Ph, (CH2)7OR2; R2 = tet ...
Upon treatment with Me2TiCl2 or Me3Al in the presence of TiCl4, an H atom at the olefinic 4-position is replaced by a Me group. Terminal homoallyl alcs. afford E isomers. If the double bond is internal, the C chain (at the other side of the OH group) gives ...
The methanol dehydration reaction was studied over environmentally benign, easily accessible and inexpensive K10 montmorillonite clay used as the catalyst at a temperature range between 200–700 °C. Nearly 100% selectivity towards dimethyl ether (DME) at 80 ...
The synthesis of the biological active undecapeptide substance P with the liquid-phase method (LPM) is described. The over-all-yield of the synthesis is high and the peptide shows full biological activity. The synthesis demonstrates that the modification o ...
The usefulness of 6-nitro BIPS as a photochromic tracer in org. liqs. was investigated. The photochromic effect of this dye permits the soln. to be decolored conveniently after each tracer expt. so that the same liq. may be used in a closed loop for a larg ...
The separation of hydrogen isotopes for applications such as nuclear fusion is a major challenge. Current technologies are energy intensive and inefficient. Nanoporous materials have the potential to separate hydrogen isotopes by kinetic quantum sieving, b ...
