The present invention relates to an improved process for preparing 2,7-dimethylocta-2,4,6-trienedial of the formula I, ##STR00001## by a) double enol ether condensation of a butenedial bisacetal of the formula II with an enol ether of the formula III, ##STR00002## in the presence of a Lewis acid catalyst to give a condensation product of the formula IV, ##STR00003## where the radicals R.sub.1 and R.sub.2 in formulae II to IV are independently of one another C.sub.1-C.sub.6-alkyl;b) hydrolysis of...

The catalytic process obtains a methyl tertiary butyl ether by feeding methanol over a solid catalyst section in a rectifying column having vertical layers in which a catalyst material is enclosed. At least one of the enclosing walls is impermeable to the catalyst material while being permeable to the methanol. A reactant comprising a mixture of saturated and unsaturated 4 carbon-chain hydrocarbons is fed into the solid catalyst section with methanol to produce a methyl tertiary butyl ether.

Aldehyde derivatives of polyethylene glycols and methods of making thereof are disclosed. These aldehyde derivatives can be used to make polyethylene glycol-hydrazines, polyethylene glycol-thiols, polyethylene glycol amines, and branched polyethylene glycols. PEG aldehyde derivatives or other functional PEG derivatives prepared from PEG aldehydes are useful for protein conjugation and surface modification.

Monoterpenes of the formulae: ##STR1## wherein X, Y and Y' are independently --CHO, --CO.sub.2 H or --CH.sub.2 OR, R being hydrogen or tetrahydropyranyl, and Y may be in E- or Z-form about the adjacent double bond have been isolated from agriculturally harmful acarids and then identified. They have fragrance of citrus-note and are bactericidally active against bacteria which may cause crop injury. Some of them are the first sex pheromones to be isolated from the acarids.

Low molecular weight polyacetals are prepared by reacting an acetal-containing reagent with a polyalcohol (e.g., glycerol or sucrose), a polyamine (e.g., 3,3'-diamine-N-methyl dipropylamine or ethylene diamine), a polyester (e.g., triethyl citrate), or a polyhalide (e.g., pentaerythrityl tetrabromide). Low molecular weight polyaldehydes are prepared by converting the acetal groups of the low molecular weight polyacetal to aldehyde groups or by reacting an aldehyde-containing reagent (e.g., glyox...

The present invention discloses a method for catalytic synthesis of oxygenate from alcohol. At first, a feeding material comprising at least one alcohol is provided. Next, a copper-containing catalyst is provided and the catalyst further comprises at least one metal element selected from the group consisting of the following: zinc, magnesium, and aluminum elements. Following that, a catalytic reaction of the feeding material over the copper-containing catalyst is carried out to synthesize at lea...

2,2,9,9-Tetramethyldecanedial, 2,2,9,9-Tetramethyldecanedial disemicarbazone and di(trialkylsilyl)-derivative of 2,2,9,9-tetramethyl-1,10-decanediol are disclosed. The compounds lower serum triglyceride levels. The aldehyde can be produced by hydrolysis of a substituted imine. The aldehyde can be converted to semicarbazone derivatives by reaction with semicarbazide or its acid-addition salt. The trialkylsilyl compounds can be produced by reacting 2,2,9,9-tetramethyl-1,10-decanediol with a silyla...

A method to produce dialcohols is provided, the method comprising the steps of: providing a feed stream comprising an alpha-alcohol-diolefin; reacting the feed stream with hydrogen and carbon monoxide in the presence of a catalyst system comprising a cobalt phosphine ligand complex under conditions effective to hydroformylate at least a portion of the diolefin in the feed stream; and recovering the dialcohol from the reacted feed stream. This method is a one-step process to hydroformylate alpha-...

A process for making 2,7-dimethyl-2,4,6-octatrien-1,8-dial starting form an allylic halide is described. The process steps include aldehyde protection, conversion to a sulfide, oxidation to an allylic sulfone followed by a Ramberg-Backlund reaction and hydrolysis.

The method for producing .alpha.,.omega.-dialdehydes from .alpha.,.omega.-diolefins or .alpha.,.omega.-alkenals in good yield and with high efficiency. The expensive rhodium catalyst for hydroformylation can be reused without any substantial attrition of activity. Moreover, since the loses of the catalyst, monodentate phosphine and sulfolane used in the hydroformylation reaction are minimal, the method is commercially advantageous.