摘要:
A process for the preparation of an unsaturated diester having the formula ##STR1## wherein R is alkyl having 1 to 8 carbon atoms or aralkyl having 6 carbon atoms in the ring and from 1 to 4 carbon atoms in the alkyl moiety, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and are each hydrogen, halogen, alkyl having 1 to 4 carbon atoms or aryl having 6 carbon atoms in the ring, by reacting carbon monoxide and oxygen with a diolefin having the formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as aforesaid, in the presence of a catalytic amount of a platinum group metal compound, a copper or iron oxidant salt compound, a soluble vanadium salt and a stoichiometric amount of a dehydrating agent. Optionally, an anhydrous-halogen containing acid may be included.Alternatively, a ligand or coordination complex compound of the metal salt compound, and catalytic quantities of an alcohol may be employed.
摘要翻译:一种制备具有下式的不饱和二酯的方法,其中R是具有1至8个碳原子的烷基或在环中具有6个碳原子的芳烷基和在烷基部分中具有1至4个碳原子的芳基,R1,R2 R 3和R 4相同或不同,各自为氢,卤素,具有1至4个碳原子的烷基或环中具有6个碳原子的芳基,通过使一氧化碳和氧与具有下式的二烯烃反应:其中R1 在催化量的铂族金属化合物,铜或铁氧化剂盐化合物,可溶性钒盐和化学计量量的脱水剂的存在下,R2,R3和R4如上所述。 任选地,可以包括含有无水卤素的酸。 或者,可以使用金属盐化合物的配体配位络合物和催化量的醇。
摘要:
A process for the preparation of an unsaturated monoester having the formula ##STR1## wherein R is an alkyl group of from 1 to 4 carbon atoms and R' is hydrogen, a halogen or a methyl group, by reacting carbon monoxide, oxygen, and at least a stoichiometric amount of an enol ether, or a 1-alkoxycycloalkene dehydrating agent with a diolefin having the formula ##STR2## wherein R' is as hereinabove described, in the presence of a catalytic amount of a platinum group metal compound and a copper or iron oxidant salt compound.Alternatively, a ligand or coordination complex compound of the metal salt compound and catalytic quantitites of an alcohol may be employed.
摘要:
A cement admixture comprised of a mixture of certain alkyl ether oxyalkylene adducts with certain oxyalkylene glycols to provide cement compositions of mortar and concrete which inhibit drying shrinkage while permitting substantial air entrainment and enhanced compressive strength.
摘要:
Microemulsion cleaner compositions are disclosed. The cleaners comprise a terpene, a secondary or tertiary C.sub.4 -C.sub.5 alcohol, a surfactant, and water. Compared with commercial formulations, cleaners of the invention are low in water, high in hydrocarbon, and have excellent degreasing capability. The secondary or tertiary C.sub.4 -C.sub.5 alcohol coupling solvent, compared with other alcohols, significantly reduces the amount of surfactant required to produce a stable, effective microemulsion cleaner. The compositions are particularly valuable as metal degreasers.
摘要:
A selective process for the preparation of diphenylmethane bis(dialkylureas) is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbamate or phenylurea to the methylene bis(carbamate) and the use of a ramped temperature program are the keys to good selectivity to MDI dimer products.
摘要:
The selection of the proper solvent systems for polyalkylene carbonates which completely dissolve the polymer at high temperatures but are non-solvents at lower temperatures allows one to obtain discrete particles of the polymers suitable for many applications, processing and handling. The particles size can be controlled from about 30 to about 3000 microns in diameter.
摘要:
The evaporative casting of molten metals has been shown to produce castings having smooth surfaces without any sign of carbon deposits thereon by using a copolymer polycarbonate prepared from cyclohexene oxide, cyclopentene oxide, cycloheptene oxide, or isobutylene oxide and carbon dioxide.
摘要:
Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of trialkyl alkylalkoxylated quaternary ammonium salts, per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fast-cool and anti-lump properties.
摘要:
Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of trialkyl alkylalkoxylated quaternary ammonium salts, per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fast-cool and anti-lump properties.
摘要:
Alkoxylated ether sulfate anionic surfactants of this invention are prepared by conventional procedures, e.g., oxyalkylation with propylene oxide or 1,2-butylene oxide of a straight chain plasticizer range alcohol; optionally followed by oxyalkylation with ethylene oxide or with a mixture of ethylene oxide and higher alkylene oxide; sulfation of the alkoxylated product; and neutralization of the sulfated derivative. The alkoxylated ether sulfate anionic surfactants of the present invention are liquids which exhibit superior detergency to polyester fabrics, excellent hard water stability, organic solubility, low foaming, low odor, and exhibit excellent compatibility with non-ionic and other surfactants in detergent formulations.