By K Venkataraman (Eds.)
Read or Download The Chemistry of Synthetic Dyes PDF
Best needlecrafts & textile crafts books
A special visible listing of all of the significant thoughts and an vital better half for newcomers and skilled embroiderers alike. even if you have an interest in goldwork, beadwork, crewel embroidery, cutwork, go sew, blackwork or Hardangar, this publication will consultant you thru the entire easy tools of operating and recommend a thrilling diversity of artistic purposes for every approach.
Create lovely quilts and pillows with this pleasant choice of tasks utilizing basic ideas and pre-cuts. Rediscover the straightforward issues in existence with this pleasant number of cover tasks and pillow styles that use pre-cut jelly rolls, fats quarters, and extra. that includes easy, fully-illustrated directions, and lovely full-colour images of the completed tasks, "Simplify" is the fitting quantity for crafters seeking to upload a slightly of easy variety to their domestic - with shades and styles that the total kinfolk will love.
Supplying transparent, concise directions, this sequence has served as a vintage reference for handcrafters for greater than 30 years. A jam-packed, up-to-date source choked with new rules, this consultant is usually a responsible and entire crochet-instruction handbook. a few vintage motifs which are awarded contain an easy lace triangle, a fragile popcorn trefoil, and an complex French sq., every one labored in modern yarns and displayed in full-color images.
- Flowers Underfoot: Indian Carpets of the Mughal Era
- Basic Leathercrafting: All the Skills and Tools You Need to Get Started
- Textile Spinning, Weaving and Designing
- Patchwork Math 1: 100 Addition & Subtraction Reproducibles
- Felting - The Complete Guide
- One-Block Wonders Encore!: New Shapes, Multiple Fabrics, Out-of-this-World Quilts
Additional info for The Chemistry of Synthetic Dyes
Res. (India) 17B, 33 (1958). 23 I. NAPHTHOQUINONOID DYES AND PIGMENTS I t is interesting to note t h a t whereas benzoylacetonitrile reacts with (I) in the presence of isoquinoline to yield (XLVII), the reaction when carried out in presence of pyridine does not yield a pyrrocoline derivative, but gives 2-phenyl-3-cyano[2,3-&]naphthofuran-4,9-dione (XLVIII). 3 3 2. Synthesis of 2,3-Phthaloylpyrrocolines by Ring Closure of Ylidene-enol Betaines Methylation of the pyridinium betainę (XX) with dimethyl sulfate yields 3-(2-methoxy-l ,4-naphthoquinonyl)pyridinium methosulfate (XLIX).
D . TIL AK In the above reactions pyridine reacts with ethyl chloroacetate to give the quaternary salt (XLII), which can readily form a reactive nitrogen ylid which reacts with the 2-chloro-l,4-naphthoquinone-3-pyridinium chloride (XIX). The formation of the carbanion (XLIV) is followed by cyclization and subsequent removal of pyridine, a very good leaving group. This method gives exclusively l-carbethoxy-2,3-phthaloylpyrrocoline (XXXVI) as against the method using ethyl acetoacetate, in which both (XXXVI) and l-acetyl-2,3-phthaloylpyrrocoline (XL) are formed.
IV. Miscellaneous Dyes 2-Amino-3-chloro-l,4-naphthoquinone (CXIII) obtained by reacting (I) with aqueous ammonia in boiling ethanol is a useful intermediate for synthesis of a few vat dye systems. A. 1-#-NAPHTHO[2,3-Í2]IMIDAZOLE-4,9-DIONE When 2-acetylamino-3-amino-l,4-naphthoquinone is heated with ethyl orthoformate in sulfuric acid, it undergoes cyclization to yield 2-methyl-l-£r-naphtho[2,3-d]imidazole-4,9-dione(CXIV). 68 68 J. R. E. Hoover and A. R. Day, J. Am. Chem. Soc. 76, 4148 (1954). 46 B.