Raw Materials Sponsored by
Methods leading to (–)-, (+)-, and (±)-carvone have been reviewed, The technical production of (–)-carvone is based on the widely available (+)-limonene; the most favored route is that epitomized in Chart 1. Though the steps involved are simple, their exploitation is a wellguarded secret, There is no similar commercialscale production of (+)-carvone because the basic materials for its synthesis are not as readily available. However, sooner or later the rising demand for this ketone will ensure that it, too, will be produced synthetically.
The transformation of Norda is nearly complete, and it is now poised to challenge the very largest international leaders in the flavor and fragrance industry.
This new plant is in continuous production, producing only l-menthol. The total employment at this plant is 49, with 32 people in production. These 32 operate the plant 24 hours a day, seven days a week. The process is a very intricate and complicated series of completely continuous operations combined with automatic sequencing batch processes.
The very interesting and unique combination of a strong historical position in aroma chemicals together with a very old and top quality processor of natural materials gives the Naarden organization an unparalleled range of products to use internally, as well as to market to the worldwide industry.
The indan derivatives which contain only carbon, hydrogen, and oxygen are unique herbicides, and we are hopeful that they will partly fill the present day need for harmless biodegradable pesticides.
Many other examples could be cited but those discussed above serve to make the point that we are part of the dynamic chemical industry where technological obsolescence is built into each new development. The resultant competitive pressure will keep our segment of the industry young and vigorous.
The odor character of the flowers of lily of the valley (Convallaria majalis L.) is appreciated by almost everyone. An essential oil of the flowers is not commercially available. Therefore, perfumers must create compositions of this odor type based upon their memory of the natural product, using other essential oils and synthetic fragrance materials.
When Semmler elucidated the structure of p-menth-1-ene by oxidative degradation in 1903, little was it thought that this simple hydrocarbon would serve as a substrate for the exciting researches which we have delineated. Today, scientists devoted to aroma chemistry are well aware of the sensory properties pertaining to odor and taste of the products mentioned in this paper. Available readily in optically active and inactive forms, p-menth-1-ene still challenges us with problems of far-flung consequences.
I would like to encourage continued research into the chemistry of natural materials. Often fascinating new chemicals can be produced directly by isolation from essential oils, or by further chemical processing of these isolates. Despite legislative difficulties, this work should be continued apace. Our growth and future lies here.
BSP Symposium Report. The third annual symposium of Modern Perfumery Chemicals, sponsored by the British Society of Perfumers was held at the London Tara HoteI on April 14, 1983. There were approximately 130 participants from over 30 companies, an increase from last year’s symposium. Participants were divided into three sections, so that the six presenting companies each made three presentations, David Butterfield, President of the BSP, organized the proceedings.