The synthesis of original structures for the fragrance industry bearing bicyclic scaffolds is described. To the best of our knowledge, these structures are not found in the fragrance industry neither from natural nor synthetic pathways. NHC gold type catalysts showed excellent activities leading to light bicyclic enol ethers. Several bicyclic adducts were prepared in good to excellent yields (18-99%). Evaluation of NHC-Au complexes allowed to reach a TOF of 300 h-1. The evaluation for the organoleptic properties of [4.1.0]-bicyclic ethers were compared with the unprecedented properties of the 1,6-enyne precursors. The evaluations of starting materials showed a great interest on these structures with various olfactive facets. In this study we depicted the similarity and differences between starting ethers and their cycloisomerized bicyclic counterparts.
PurposeThis paper aims to analyze the pertinence of Bradford's law applied to a set of electronic periodical collections in a given discipline.Design/methodology/approachThis study applied Bradford's law using citations rather than articles from a theme, thus ensuring the pertinence of the periodicals cited. Concentrating on citations in articles focuses on the stage following research rather than prior stages. The sources are actually used because they have been cited.FindingsThe study demonstrates the data centrality phenomenon based on the leading periodicals in a theme. There was a relationship between the electronic periodical collection and the number of citations in the relevant journals in a theme.Originality/valueAlthough today's use of periodical titles is defined first and foremost by readership statistics, a more detailed analysis on the qualitative aspect can be an additional benefit in the negotiations conducted on a macro scale. Using Bradford's law could be envisaged as a complementary tool for a sustainable management of commercial electronic resources.
(Executive Summary for JITE)FragforNET is a North-South network platform to communicate, disseminate and archive information and knowledge on forest fragmentation and biodiversity loss http://fragfornet.grenoble.cemagref.fr/. This network intends to become a portal for researchers, stakeholders, policy makers and the public to exchange ideas, knowledge, data, experiences and results on the loss on biodiversity in the remaining native forests of South America. The activities in relation to the spread of information and access to documentation focus on two main aspects: development of information access and communication tools and enhancement of the identification of Documentary Centre's and specialised libraries by the creation of a common directory. Actions are being done to contribute to an information portal in relation to forest conservation.
Gold-catalyzed Prins-type cyclizations are interesting
strategies
for synthesizing complex molecules with excellent diastereoselectivity.
We developed a novel and efficient system for such processes (13 examples,
≤89% yield) and reported the first enantioselective version
of a gold-catalyzed Prins-type cyclization using a new chiral TADDOL-based
Au(I) phosphonite complex. After crystallization, highly enantiomerically
enriched products were obtained with >99% ee.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.