Results 41 to 50 of about 41,404 (206)

Bi-bicyclic and bi-tricyclic compounds from Dendrobium thyrsiflorum

, 2005
One bi-bicyclic and two bi-tricyclic derivatives of coumarin–benzofuran, phenanthrene–phenanthrene and phenanthrene–phenanthraquinone, along with seven known compounds, were isolated from stems of Dendrobium thyrsiflorum Rchb.f. (Orchidaceae).
Zhang, G.N., Zhong, L.Y., Guo, Y.L., Zhang, M., Wang, Z., Xu, L., Bligh, S.W.A., Zhang, C.-F.   +7 more
core   +1 more source

Orthogonal ring-closing alkyne and olefin metathesis for the synthesis of small GTPase-targeting bicyclic peptides

Nature Communications, 2016
Bicyclic peptides can inhibit biological targets hard to address with small molecules. Here, the authors combine two orthogonal ring-closing reactions to produce bicyclic peptides with improved bioactivity thereby providing a strategy that can greatly ...
Philipp M. Cromm, Sebastian Schaubach, Jochen Spiegel, Alois Fürstner, Tom N. Grossmann, Herbert Waldmann   +5 more
doaj   +1 more source

Highly Efficient and Modularly Tuned Bicyclic Organocatalyst for the Enantioselective Michael Addition of Aldehydes to Nitroalkenes

, 2011
Highly Efficient and Modularly Tuned Bicyclic Organocatalyst for the Enantioselective Michael Addition of Aldehydes to NitroalkenesA new type of bicyclic organocatalyst has been successfully applied to the asymmetric Michael addition of aldehydes to ...
Lu, Yun-Peng, Loh, Teck-Peng, Liu, Yan-Ling, Teck-PengLoh, Xu, Feng-Xia, Xiao, Jian   +5 more
core   +1 more source

The Aα-spectral radius of complements of bicyclic and tricyclic graphs with n vertices

Special Matrices, 2021
Recently, the extremal problem of the spectral radius in the class of complements of trees, unicyclic graphs, bicyclic graphs and tricyclic graphs had been studied widely.
Chen Chaohui, Peng Jiarong, Chen Tianyuan   +2 more
doaj   +1 more source

First diastereoselective total synthesis of bicyclic styryl lactone: (1R,5R,7R)-7-((E)-styryl)-2,6-dioxabicyclo[3.3.1]nonan-3-one

Results in Chemistry, 2023
A concise and facile diastereoselective first total synthesis of bicyclic styryl lactone 1 is described in nine steps. This biologically active bicyclic styryl lactone was obtained in 8% overall yield from cinnamaldehyde 2 and (R)-3-hydroxyhex-5-enoic ...
Dhanraj O. Biradar, Yogesh D. Mane, A.V. Narsaiah, B.V. Subba Reddy   +3 more
doaj   +1 more source

Bicyclic-guanidines, -guanidinates and -guanidinium salts: wide ranging applications from a simple family of molecules

, 2009
Bicyclic guanidines have physical, electronic and chemical properties that differentiate them from their acyclic counterparts, with many of these characteristics directly imposed by the rigid framework.
Martyn Coles (16061012)
core   +1 more source

Anaerobic Degradation of Bicyclic Monoterpenes in Castellaniella defragrans

Metabolites, 2018
The microbial degradation pathways of bicyclic monoterpenes contain unknown enzymes for carbon–carbon cleavages. Such enzymes may also be present in the betaproteobacterium Castellaniella defragrans, a model organism to study the anaerobic monoterpene ...
Edinson Puentes-Cala, Manuel Liebeke, Stephanie Markert, Jens Harder   +3 more
doaj   +1 more source

Stable Bicyclic Functionalized Nitroxides: The Synthesis of Derivatives of Aza-nortropinone–5-Methyl-3-oxo-6,8-diazabicyclo[3.2.1]-6-octene 8-oxyls

Molecules, 2021
In recent decades, bicyclic nitroxyl radicals have caught chemists’ attention as selective catalysts for the oxidation of alcohols and amines and as additives and mediators in directed C-H oxidative transformations.
Larisa N. Grigor’eva, Alexsei Ya. Tikhonov, Konstantin A. Lomanovich, Dmitrii G. Mazhukin   +3 more
doaj   +1 more source

On the bicycle problem

Discrete Applied Mathematics, 1983
AbstractWe present a counterexample to a conjecture of Shinji Masuda.
openaire   +1 more source

Bicyclic Steiner triple systems

, 1994
A Steiner triple system admitting an automorphism whose disjoint cyclic decomposition consists of two cycles is said to be bicyclic.
Calahan-Zijlstra, Rebecca, Gardner, Robert B.   +1 more
core   +1 more source