187,070 research outputs found
Clemmensen reduction of diosgenin and kryptogenin: synthesis of [16,16,22,22,23,23-H-2(6)]-(25R)-26-hydroxycholesterol.
No full textA new experimental protocol has been established for the Clemmensen reduction of diosgenin and kryptogenin with the aim to prepare deuterated isotopomers of (25R)-26-hydroxycholesterol. Uncontrolled deuteration has been achieved from diosgenin, whereas [16,16,22,22,23,232 H-2(6)]-(25R)-26-hydroxycholesterol (1) can be synthesized from kryptogenin
STRUCTURE OF A BY-PRODUCT OBTAINED DURING THE CLEMMENSEN REDUCTION OF β-(p-CYMOYL-2)-PROPIONIC ACID
No full textA by-product, m. p. 210-11°. obtained during the Clemmensen reduction of β-(p-cymoyl-2)- propionic acid, has been found to be a. pioacol-dilactone. The structure has been confirmed by synthesis
Clemmensen.Koppe.2018.Supplementary_material – Supplemental material for Normality, subjectivity and mental health: A genealogy of Danish psychiatry, 1938–2017
No full textSupplemental material, Clemmensen.Koppe.2018.Supplementary_material for Normality, subjectivity and mental health: A genealogy of Danish psychiatry, 1938–2017 by Malene Broch Clemmensen and Simo Køppe in Health:</p
Late Pleistocene costal systems of northwestern sardinia (italy): sandy beaches, coastal dunes and alluvial fans. Pre-congress field trip FT 1
No full textAuthor-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Reduction of some flavanones and E-3-benzylideneflavanones under modified Clemmensen reduction condition
No full textDepartment of Chemistry, Srikrishna College, Bagula-741 502, Nadia, West Bengal, India
E-mail : [email protected]
Department of Chemistry, Chandidas'Mahavidyalaya, Khujutipara-731 215, Birbhum, West Bengal, India
E-mail : [email protected]
Department of Chemistry, Jadavpur University, Kolkata-700 032, India
E-mail : [email protected]
Manuscript received 3 April 2008, accepted 28 April 2008
A mild and efficient method for reduction of flavanones and E-3-benzylideneflavanones has been developed by using modified Clemmensen reduction condition [Zn(Hg), CH3COOH, EtOH, reflux, 1.5 h]. Flavanones gave flavans and E-3-benzylideneflavanones gave 3-benzylflavans and 3-benzylflav-3-enes
Motivation, Participation, and Engagement in Human Work Interaction Design Literature
No full textThis position paper is aimed at presenting as discussion material at the CoPDA 2016 Workshop the preliminary results of a short review of the literature published by the HWID community in the last 10 years in four books. Specifi-cally, the attention is posed on understanding the importance of motivation, par-ticipation, and engagement in Interaction Design projects for smart and pervasive workplaces
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