Sesquiterpenes and Lignans from Tephrosia vogelii

Abstract

A new guaiane sesquiterpene, (1b,6a,10a)-guai-4(15)-ene-6,7,10-triol (1), and a new lignan, (þ)-lariciresinol 9'-stearate (2), were isolated from the aerial parts of a leguminosae plant, Tephrosia vogelii, together with three known compounds, teclenone B, (1b,7R*)-opposit-4(15)-ene-1,7-diol, and pinoresinol. Their structures were elucidated on the basis of spectral data.

The chemical constituents of Piper kadsura and their cytotoxic and anti-neuroinflammtaory activities

“…The configuration of C-10 is then determined by the NOESY correlations H-1/H-14 and H-6/H-14, and the lack of the correlations H-5/H-14 and H-7/H-14, suggested that methyl group (δ 29.7) at C-10 was α-oriented in equatorial position [16][17][18]. The downfield resonance (δ 2.62) of the H-5 proton, due to a cis spatial relationship with the OH-10, also supported this point [16].…”

“…Kadsuguain A (1) was obtained as a colourless gum, whose molecular formula was determined to be C 15 , and between H-6 and H-7 (each 10.5 Hz) indicated that H-5 and H-7 were positioned at the same orientation (β-form) and H-1 and H-6 were then on the opposite side (α-form) [17]. The configuration of C-10 is then determined by the NOESY correlations H-1/H-14 and H-6/H-14, and the lack of the correlations H-5/H-14 and H-7/H-14, suggested that methyl group (δ 29.7) at C-10 was α-oriented in equatorial position [16][17][18].…”

Plug & play operation of distributed energy resources in micro-grids

“…In case of cabled distribution, the line impedance is mostly resistive and solution (11) is no longer applicable. An alternative solution can be found by observing that an active node like node B in Fig.2 I & takes the optimum value (7.b).…”

“…In this case, equation (11) can be implemented in the EPP digital controller. A current limit is also set, to keep the actual currents within the converter capability.…”

“…OPTIMUM CONTROL BASED ON NEIGHBOR-TALK APPROACH Although this paper relates to plug & play control of EPPs in smart micro-grids, we refer to an optimum control technique [9], which is applicable if neighbor active nodes (i.e., grid nodes where an EPP is connected) communicate with each other. Optimum control allows minimization of distribution loss [10,11], full exploitation of distributed energy resources, and voltage support [12].…”