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Search for "recyclable" in Full Text gives 89 result(s) in Beilstein Journal of Organic Chemistry.
Air-stable, recyclable, and time-efficient diphenylphosphinite cellulose-supported palladium nanoparticles as a catalyst for Suzuki–Miyaura reactions
Beilstein J. Org. Chem. 2011, 7, 378–385, doi:10.3762/bjoc.7.48
Olefin metathesis in nano-sized systems
Beilstein J. Org. Chem. 2011, 7, 94–103, doi:10.3762/bjoc.7.13
- and provided the first recyclable metallodendritic catalysts [21]. Moreover, dendritic bis-phosphines with two phenyl groups on each phosphorus atom very cleanly yielded the first dendrimers decorated with clusters at the periphery via an efficient electron-transfer-chain reaction using [Ru3(CO)12
- RCM with the fully recyclable water solution of the dendritic nanoreactor. Strategy for the ROMP of norbornene by Ru-benzylidene dendrimers to form dendrimer-cored stars. Third-generation (16 Ru atoms) ruthenium-benzylidene dendrimer that catalyzes the ROMP of norbornene at 25 °C to form dendrimer
New library of aminosulfonyl-tagged Hoveyda–Grubbs type complexes: Synthesis, kinetic studies and activity in olefin metathesis transformations
Beilstein J. Org. Chem. 2010, 6, 1159–1166, doi:10.3762/bjoc.6.132
- of the active species (due to NHC), these catalysts still required a high catalytic loading (up to 20 mol % in some cases [7]). Later, Hoveyda synthesized a recyclable phosphine-free precatalyst (2a) [8] based on a release/return concept of the benzylidene ether fragment. Electronic or steric
Suzuki–Miyaura cross-coupling reaction of 1-aryltriazenes with arylboronic acids catalyzed by a recyclable polymer-supported N-heterocyclic carbene–palladium complex catalyst
Beilstein J. Org. Chem. 2010, 6, No. 70, doi:10.3762/bjoc.6.70
- Suzuki–Miyaura cross-coupling reaction of 1-aryltriazenes with arylboronic acids catalyzed by a recyclable polymer-supported Pd–NHC complex catalyst has been realized for the first time. The polymer-supported catalyst can be re-used several times still retaining high activity for this transformation
- ; recyclable catalyst; Suzuki–Miyaura reaction; Introduction The unsymmetrical biaryls feature in a diverse range of organic compounds, such as natural products, advanced materials, liquid crystals, ligands and molecules of medicinal interest [1][2][3][4]. The palladium-catalyzed Suzuki–Miyaura cross-coupling
- development of a recyclable catalytic system for the Suzuki–Miyaura coupling reactions of 1-aryltriazenes is highly desirable. Although several types of heterogenous catalytic systems have been described for the Suzuki–Miyaura reactions of aryl halides [30], to the best of our knowledge, there has been no
Hydroxyapatite supported caesium carbonate as a new recyclable solid base catalyst for the Knoevenagel condensation in water
Beilstein J. Org. Chem. 2009, 5, No. 68, doi:10.3762/bjoc.5.68
- water is described. HAP–Cs2CO3 was found to be a highly active, stable and recyclable catalyst under the reaction conditions. Keywords: ethyl cyanoacetate; hydroxyapatite supported caesium carbonate; Knoevenagel condensation; malonic acid; malononitrile; Introduction An area of recent intense
- acid with this mild procedure was 88% (3b, Table 2). The protocol described above provides an efficient method for Knoevenagel condensation between aromatic aldehydes and active methylene groups using HAP–Cs2CO3 as a new recyclable solid base catalyst in water. Moreover, the recyclability of this
Asymmetric reactions in continuous flow
Beilstein J. Org. Chem. 2009, 5, No. 19, doi:10.3762/bjoc.5.19
- compounds. Supported catalysts are in principle recoverable and, ideally, recyclable. With potential longer term usage, chemical processes can become more economically and environmentally friendly [16][17]. In conjunction with continuous flow, the reaction and separation of catalysts can be performed
A biphasic oxidation of alcohols to aldehydes and ketones using a simplified packed- bed microreactor
Beilstein J. Org. Chem. 2009, 5, No. 17, doi:10.3762/bjoc.5.17
- , leading to no disruptions or degradation of the packing material. Thus, the AO-TEMPO resins are recyclable, showing no loss of catalytic activity and a substrate scope that encompasses many primary and secondary alcohols. The devices presented are predicted to be readily scaled-up to achieve the desired
Silica- bound benzoyl chloride mediated the solid- phase synthesis of 4H-3,1-benzoxazin- 4-ones
Beilstein J. Org. Chem. 2009, 5, No. 13, doi:10.3762/bjoc.5.13
- -phase reagent for cyclodehydrating N-acylanthranilic acids 2a–f. Accordingly, we introduce it here as an efficient and recyclable dehydrating agent for convenient synthesis of 4H-3,1-benzoxazin-4-ones. Results and Discussion As is shown in Scheme 1, an approach consisting of three steps was employed for
Zeolite catalyzed solvent- free one-pot synthesis of dihydropyrimidin- 2(1H)-ones – A practical synthesis of monastrol
Beilstein J. Org. Chem. 2009, 5, No. 4, doi:10.3762/bjoc.5.4
- Abstract A zeolite-catalyzed, simple, one-pot, solvent-free, cost effective, and environmentally benign process for the synthesis of dihydropyrimidones is described. This reaction is scaleable to multigram scale and the catalyst is recyclable. This methodology has resulted in an efficient synthesis of
Chemoselective reduction of aldehydes by ruthenium trichloride and resin- bound formates
Beilstein J. Org. Chem. 2008, 4, No. 53, doi:10.3762/bjoc.4.53
- [25]. Pd-catalyzed transfer hydrogenation of nitroarenes using recyclable polymer-supported formate has been investigated by Abiraj et al [26]. Neither of these conditions were, however, effective in reducing aryl ketones. Since aryl alcohols are important compounds, we became interested to look at
Synthesis of deep- cavity fluorous calix[4]arenes as molecular recognition scaffolds
Beilstein J. Org. Chem. 2008, 4, No. 36, doi:10.3762/bjoc.4.36
- recyclable reagents [18] to the total synthesis of natural products [19]. Fluorous compounds are the basis for highly selective ion sensors that show promise by virtue of their low level of biofouling [20]. Recently, it was shown that simple fluorous compounds act as molecular receptors for selective
Ru-catalyzed dehydrogenative coupling of carboxylic acids and silanes - a new method for the preparation of silyl ester
Beilstein J. Org. Chem. 2008, 4, No. 27, doi:10.3762/bjoc.4.27
- recyclable materials [2][3][4][5][6][7][8][9][10][11][12]. To develop simple, economical and practical protocols for the conversion of carboxylic acids into silyl esters is not only required in normal organic synthesis procedure, but is also a prerequisite for the accurate performance of gas-chromatographic
m-Iodosylbenzoic acid – a convenient recyclable reagent for highly efficient aromatic iodinations
Beilstein J. Org. Chem. 2007, 3, No. 19, doi:10.1186/1860-5397-3-19
- purification by means of specific phase separation or scavenging. [39][40][41] Results and discussion In this context, we recently described an improved procedure for the preparation of the hardly known m-iodosylbenzoic acid 6 and showed that it is a recyclable reagent for the highly efficient RuCl3-catalyzed
- oxidation of alcohols to aldehydes and ketones. [42] In the present work we demonstrate the utility of m-iodosylbenzoic acid 6 as a recyclable reagent for the iodination of arenes. In fact reagent 6 can be regarded as a tagged version of iodoso benzene 5 which, if used in access, can be conveniently removed
Asymmetric aza-Diels- Alder reaction of Danishefsky's diene with imines in a chiral reaction medium
Beilstein J. Org. Chem. 2006, 2, No. 18, doi:10.1186/1860-5397-2-18
- related Baylis-Hillman reaction between p-nitrobenzaldehyde and methyl acrylate using the above chiral IL.[25] A slight increase in de (not optimized value) was detected when employing p-methoxyphenyl (Table 3, entry 2, R = p-MeOC6H4). ILs are highly recyclable and do not lose any of their properties even
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