Cover Picture: Stereo‐ and Regioselective Phyllobilane Oxidation in Leaf Homogenates of the Peace Lily (Spathiphyllum wallisii): Hypothetical Endogenous Path to Yellow Chlorophyll Catabolites (Chem. Eur. J. 1/2015)

Abstract

Chlorophyll is broken down in leaves during Fall to colorless tetrapyrroles, so‐called phyllobilanes, which are degraded further in leaves into yellow oxidation products. The hypothetical “missing link” between the colorless and the yellow catabolites has now appeared on the scene, as described in the Full Paper by B. Kräutler et al. on

Comprehensive characterization of non-cellulosic recalcitrant cell wall carbohydrates in unhydrolyzed solids from AFEX-pretreated corn stover

“…Some of the epitope linkages have been identified in previous work. For example, xylan-5 mAb recognizes one of the most recalcitrant non-cellulosic glycans present in UHS and hydrolysate [42, 43]. The epitope for this mAb contains a 4- O -methyl glucuronic acid side residue on an otherwise linear xylan backbone (Table 1) [44].…”

Efficient palladium-catalyzed C(sp2)–H activation towards the synthesis of fluorenes

“…[4][5][6][7][8][9] The traditional strategies to synthesize fluorene derivatives include Friedel-Crafts-type reactions, [10][11][12][13][14] radical cyclization, [15][16][17][18] and transition metal-mediated cyclization. [19][20][21][22][23][24][25][26] Comparatively, because of its simplicity, cleanliness and atom economy, transition metal-catalyzed cyclization, through a C-H bond activation with subsequent C-C bond formation, [27][28][29] has emerged as the most efficient strategy and palladium is the most widely used catalyst which has been extensively investigated. Of these synthetic procedures, closing the central five-membered ring is the key step in most employed strategies.…”