Claims
- 1. A product comprising a major proportion of at least one compound defined according to the structure: ##STR232## wherein Y is the moiety having the structure: ##STR233## wherein one of the dashed lines represents a carbon-carbon single bond and the other of the dashed lines represents a carbon-carbon double bond; wherein R.sub.1 and R.sub.2 represent hydrogen or methyl with the proviso that one of R.sub.1 or R.sub.2 is hydrogen and the other of R.sub.1 and R.sub.2 is methyl; wherein R.sub.4, R.sub.5 and R.sub.6 represent hydrogen or methyl with the proviso that one of R.sub.4, R.sub.5 and R.sub.6 is methyl and the other two of R.sub.4, R.sub.5 and R.sub.6 are hydrogen; and wherein R.sub.3 is formyl; produced by the process comprising the step of reacting in the presence of a protonic acid catalyst or a Lewis acid catalyst at least one methyl cyclopentadiene isomer having a structure selected from the group consisting of: ##STR234## or at least one precursor thereof having a structure selected from the group consisting of: ##STR235## formic acid or a formic acid precursor at a temperature in the range of from about 0.degree. C. up to about 50.degree. C. with the concentration of acid catalyst in the reaction mass varying from 0.01% up to 1 mole % based on the weight of reaction mass.
- 2. A product comprising a major proportion of at least one compound defined according to the structure: ##STR236## wherein Y is the moiety having the structure: ##STR237## wherein one of the dashed lines represents a carbon-carbon single bond and the other of the dashed lines represents a carbon-carbon double bond; wherein R.sub.1 and R.sub.2 represent hydrogen or methyl with the proviso that one of R.sub.1 or R.sub.2 is hydrogen and the other of R.sub.1 and R.sub.2 is methyl; wherein R.sub.4, R.sub.5 and R.sub.6 represent hydrogen or methyl with the proviso that one of R.sub.4, R.sub.5 and R.sub.6 is methyl and the other two of R.sub.4, R.sub.5 and R.sub.6 is hydrogen; and wherein R.sub.3 is acetyl; produced by the process comprising the step of reacting in the presence of a protonic acid catalyst or a Lewis acid catalyst at least one methyl cyclopentadiene isomer having a structure selected from the group consisting of: ##STR238## or at least one precursor thereof having a structure selected from the group consisting of: ##STR239## with acetic acid or acetic anhydride at a temperature in the range of from about 0.degree. C. up to about 50.degree. C. with the concentration of acid catalyst in the reaction mass varying from 0.01% up to 1 mole % based on the weight of reaction mass.
- 3. A product comprising a major proportion of at least one compound defined according to the structure: ##STR240## wherein Y is the moiety having the structure: ##STR241## wherein one of the dashed lines represents a carbon-carbon single bond and the other of the dashed lines represents a carbon-carbon double bond; wherein R.sub.1 and R.sub.2 represent hydrogen or methyl with the proviso that one of R.sub.1 or R.sub.2 is hydrogen and the other of R.sub.1 and R.sub.2 is methyl; wherein R.sub.4, R.sub.5 and R.sub.6 represent hydrogen or methyl with the proviso that one of R.sub.4, R.sub.5 and R.sub.6 is methyl and the other two of R.sub.4, R.sub.5 and R.sub.6 is hydrogen; and wherein R.sub.3 is hydrogen; produced by the process comprising the step of reacting in the presence of a protonic acid catalyst or a Lewis acid catalyst at least one methyl cyclopentadiene isomer having a structure selected from the group consisting of: ##STR242## or at least one precursor thereof having a structure selected from the group consisting of: ##STR243## with a C.sub.1 -C.sub.2 alkanoic acid or alkanoic acid anhydride at a temperature in the range of from about 0.degree. C. up to about 50.degree. C. with a concentration of acid catalyst in the reaction mass varying from 0.01% up to 1 mole % based on the weight of reaction mass, and then hydrolyzing the resulting esters using from 10 up to 50% by weight of a strong alkali metal hydroxide at a hydrolysis temperature of from about 40.degree. C. up to reflux.
Parent Case Info
This is a continuation of application Ser. No. 220,628, filed Dec. 29, 1980, now abandoned, which, in turn, is a streamline divisional of application for U.S. Letters Patent Ser. No. 144,898 filed on Apr. 29, 1980 now U.S. Letters Pat. No. 4,275,251 issued on June 23, 1981.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2642519 |
Mar 1978 |
DEX |
815232 |
Jun 1959 |
GBX |
Non-Patent Literature Citations (5)
Entry |
Hoffman et al., CA 91:56477g. |
Opdyke, CA 92:11070y. |
Kheifits et al., CA 61:8199c. |
Zeinalov et al., CA 68:49319d. |
Arctander, Perfume and Flavor Chemicals, 1969, Monograph 1582. |
Continuations (1)
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Number |
Date |
Country |
Parent |
220628 |
Dec 1980 |
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