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A synthesis of (R)‐muscone (1), a valuable musk odorant, is presented. The stereogenic center of muscone was introduced from methyl (R)‐5‐bromo‐4‐methylpentanoate (5), a chiral pool molecule developed in our group, and the macrocyclic ring was prepared by ring‐closing metathesis (RCM) reaction.
We report novel syntheses of 12-membered macrocyclic templates and a library of 4000 macrocyclic analogs. The key macrocyclization step was performed at up to 100g scale without resorting to syringe pumps, flow reactors or large volumes of solvent. An interesting observation of considerably different permeability properties was made on diastereomeric analogs due to differences in intramolecular hydrogen...
By analyzing the relationship between the fore-scaling and post-scaling of the images' DC coefficients, this paper proposes a robust image watermarking arithmetic with scaling compatible in DCT domain. Hung together with the JPEG encoding course, this method embeds the watermark information into the DC coefficients after the discrete cosine transform and abstracts the corresponding information from...
Blind signature is very important technology in secure e-commerce. Certificateless public key cryptography avoids the using of certificate in certificate-based public key signature scheme and removes key escrow in ID-based signature scheme. In this paper we introduce the notion of blind signature into certificateless public key cryptography and propose a concrete certificateless blind signature scheme...
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