午夜插插,噜噜噜影院,啪啪伊人网,欧美熟夫,景甜吻戏视频,男人强操性感蕾丝美女视频在线网站,日本美女跳舞视频

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List D-Glyceraldehyde
453-17-8

D-Glyceraldehyde synthesis

7synthesis methods
-

Yield:453-17-8 18 g

Reaction Conditions:

with sodium periodate;sodium hydrogencarbonate in dichloromethane at 0 - 20; for 5 h;

Steps:

1S)-1-[(2R)-1,4-Dioxaspiro[4.5]dec-2-yl]-3-buten-1-ol (5).
To a cooled (0 oC) solution of mannitol diacetonide(20 g, 58.47 mmol) in CH2Cl2 (100 mL), NaIO4 (25.02 g, 116.95 mmol) followed by sat. NaHCO3 (8 mL) wereadded and stirred at room temperature for 5 h. Reaction mixture was dried (Na2SO4), filtered and evaporatedunder reduced pressure to give (R)-Glyceraldehyde (18 g) and used as such to next reaction.To a stirred and cooled (0 oC) mixture of (R)-Glyceraldehyde (18 g, 105.26 mmol) and dry Zinc (13.7 g, 210.50mmol) in THF (100 mL), allyl bromide (10.7 mL, 126.30 mmol) was added very slowly for 15 min, followed bythe addition of sat. NH4Cl (72 mL) solution. After 6 h, reaction mixture was diluted with excess sat. NH4Clsolution (50 mL) and extracted with ethyl acetate (2 x 100 mL). The organic layers were washed with water (2x 20 mL), brine (20 mL), dried (Na2SO4), evaporated under reduced pressure and purified the residue bycolumn chromatography (Silica gel, 60-120 mesh, 5% EtOAc in pet. ether) to furnish 5 (17.5 g, 78%) as a yellowliquid. [a]D +1.7 (c 2.5, CHCl3); IR (neat): 2985, 2936, 2863, 1613, 1513 cm-1; 1H NMR (CDCl3, 500 MHz) δ (ppm):5.87-5.77 (m, 2H), 5.14-5.10 (m, 2H), 3.98-3.91 (m, 2H), 3.89-3.85 (m, 1H), 3.72-3.69 (m, 1H), 2.23-2.14 (m,2H), 1.60-1.55 (m, 8H), 1.41-1.38 (m, 2H); ESIMS: 235 (M+ Na)+, 213 (M + H).

References:

Bommagani, Shobanbabu;Thodupunuri, Prashanth;Sharma, Gangavaram V.M. [Arkivoc,2017,vol. 2017,# 4,p. 20 - 33]

FullText

D-Glyceraldehyde Related Search: