80657-64-3

A modified dimethylnaphthalene formaldehyde resin obtained by modifying a polyfunctional dimethylnaphthalene formaldehyde resin having a constituent unit represented by the following general formula [1] in a molecule thereof with at least one member selected from the group consisting of a phenol represented by the following general formula [2], a naphthol represented by the following general formula [3] and a naphthol represented by the following general formula [4] provided that at least any of the naphthol represented by the general formula [3] or the naphthol represented by the general formula [4] must be included.

In the production of carboxylic acid or carboxylic acid ester, a reaction product containing the carboxylic acid or carboxylic acid ester which has been produced by the reaction of an olefin, carbon monoxide, and water or an alcohol in the presence of HF is heat-treated in the presence of an acid catalyst and an acid adsorbent. By the heat treatment, the contamination of the carboxylic acid or carboxylic acid ester with HF and/or fluorine compounds such as acyl fluorides can be prevented, to enable the stable production of a high quality and high purity carboxylic acid or carboxylic acid ester without causing troubles such as corrosion of apparatus.

An object of the present invention is to provide a process for producing high purity tricyclo[5. 2. 1. 02,6]decane-2-carboxylic acid ester which has a small content of an unsaturated compound and which has an excellent fragrance and is useful as a perfume or a perfume component. In a process for producing tricycle[5. 2. 1. 02,6]decane-2-carboxylic acid ester by reacting tricycle[5. 2. 1. 02,6]deca-3-ene with carbon monoxide and alcohol in the presence of HF, carried out separately are (a) a step in which tricycle[5. 2. 1. 02,6]deca-3-ene is reacted with carbon monoxide to produce acyl fluoride and (b) a step in which acyl fluoride obtained in the step described above is reacted with alcohol to produce an ester, whereby tricyclo[5. 2. 1. 02,6]decane-2-carboxylic acid ester having a small content of an unsaturated compound can be obtained at a high yield. Also, the reaction conditions at the step (a) described above are selected or a step for carrying out isomerization reaction of tricyclo[5. 2. 1. 02,6]decane-2-carboxylic fluoride obtained at the step (a) is interposed between the step (a) and the step (b), whereby capable of being efficiently produced is tricycle[5. 2. 1. 02,6]decane-2-carboxylic acid ester having a structural ratio of 1.0 or more in exo-tricyclo[5. 2. 1. 02,6]decane-endo-2-carboxylic acid ester/endo-tricyclo[5. 2. 1. 02,6]decane-exo-2-carboxylic acid ester Further, the crude product of tricyclo[5. 2. 1. 02,6]decane-2-carboxylic acid ester thus obtained is subjected to contact treatment with specific glycol in the presence of an acid catalyst and then distilled, whereby high purity tricyclo[5. 2. 1. 02,6]decane-2-carboxylic acid ester which is reduced in impurity aldehyde and which is excellent in a fragrance can industrially advantageously be produced.

Tricyclic carboxylic acid esters having the formula: STR1 wherein R is an alkyl group of 2 or 3 carbon atoms. These compounds have a woody fragrance and are useful as components of perfume compositions.