The Sesquiterpenes a Monograph
The Sesquiterpenes a Monograph
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Until 1899 the dihydrochloride of caryophyllene had not been prepared in a crystalline condition, but Schreiner and Kremers" showed, that it could be obtained in the form of crystals melting at (i9 70. Whether these ea, rly investigators had this same dihydro- chloride in hand is very doubtful irom their analyses, but this, as well as their widely different melting points may possibly have been due to a very impure condition of their product.
Another discrepancy is the fact that Strauss 100, Br...ix 1 and also Levy and Englander 2 found the vapor density to agree with the formula CaoH32. This, however, may be explained by the changes which these high boiling sesquiterpenes suffer when vaporized. The specific gravity of the fractions of copaiba balsam oil as given by these investigators is usually somewhat low for caryophyllene, but the boiling point, and also the rotatory power when given, agree fairly well with impure caryophyllene. There are, however, a number of commercial varieties of copaiba balsam and the widely varying rotatory power of different samples of the oil, from 7 to 35, would seem to indicate the presence of other hydrocarbons or possibly oxygenated constituents in some of these.
What to read after The Sesquiterpenes a Monograph?
You can find similar books in the "Read Also" column, or choose other free books by Oswald Schreiner to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Until 1899 the dihydrochloride of caryophyllene had not been prepared in a crystalline condition, but Schreiner and Kremers" showed, that it could be obtained in the form of crystals melting at (i9 70. Whether these ea, rly investigators had this same dihydro- chloride in hand is very doubtful irom their analyses, but this, as well as their widely different melting points may possibly have been due to a very impure condition of their product.
Another discrepancy is the fact that Strauss 100, Br...ix 1 and also Levy and Englander 2 found the vapor density to agree with the formula CaoH32. This, however, may be explained by the changes which these high boiling sesquiterpenes suffer when vaporized. The specific gravity of the fractions of copaiba balsam oil as given by these investigators is usually somewhat low for caryophyllene, but the boiling point, and also the rotatory power when given, agree fairly well with impure caryophyllene. There are, however, a number of commercial varieties of copaiba balsam and the widely varying rotatory power of different samples of the oil, from 7 to 35, would seem to indicate the presence of other hydrocarbons or possibly oxygenated constituents in some of these.
What to read after The Sesquiterpenes a Monograph?
You can find similar books in the "Read Also" column, or choose other free books by Oswald Schreiner to read onlineMoreLess
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