Lime

Base Information

• Chemical Name: Lime
• CAS No.: 1305-78-8
• Deprecated CAS: 104624-96-6,245321-52-2,60873-85-0
• Molecular Formula: CaO
• Molecular Weight: 56.08
• Hs Code.: 28259019
• European Community (EC) Number: 277-225-8
• UNII: C7X2M0VVNH
• DSSTox Substance ID: DTXSID5029631
• Mol file: 1305-78-8.mol

Synonyms:calciumoxide;calcium;oxygen(2-);Lime oxide;73018-51-6;MFCD00010911;calcium oxid;LIME [HSDB];CALCIUM OXIDE [MI];CALCIUM OXIDE [FCC];CALCIUM OXIDE [JAN];CALCIUM OXIDE [INCI];LIME [USP MONOGRAPH];CALCIUM OXIDE [MART.];CALCIUM OXIDE [WHO-DD];DTXSID5029631;BRPQOXSCLDDYGP-UHFFFAOYSA-N;LIME (CALCIUM OXIDE) [II];EINECS 277-225-8;AKOS032949954;ETHYLBIS(2-BROMOETHYL)CARBAMATE;FT-0604488;1,6-Octadien-3-ol, 3,7-dimethyl-, acid isomerized;1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized

Chemical Property of Lime

Chemical Property:

• Appearance/Colour: white to grey solid
• Melting Point: 2570 °C
• Refractive Index: 1.83
• Boiling Point: 2850 °C
• Flash Point: 2850°C
• PSA: 17.07000
• Density: 3.3 g/mL at 25 °C(lit.)
• LogP: -0.11880
• Storage Temp.: Store at RT.
• Sensitive.: Air & Moisture Sensitive
• Solubility.: 1.65g/l Risk of violent reaction.
• Water Solubility.: REACTS
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 1
• Rotatable Bond Count: 0
• Exact Mass: 55.9575055
• Heavy Atom Count: 2
• Complexity: 0

Purity/Quality:

99% ^*data from raw suppliers

Calcium oxide ^*data from reagent suppliers

Safty Information:

• Pictogram(s): C,Xi
• Hazard Codes: C,Xi
• Statements: 34-41-37/38
• Safety Statements: 26-36/37/39-45-25-39

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: UVCB
• Canonical SMILES: [O-2].[Ca+2]
• General Description: Calcium oxide (CaO) plays a crucial role as a base in the copper-catalyzed enantioselective ring-opening reaction of cyclic diaryliodonium salts with O-alkylhydroxylamines, significantly improving yields and suppressing side reactions. Its use enables high enantioselectivity (up to 99% ee) in the synthesis of 2-hydroxyamino-2′-iodobiaryls, demonstrating its importance in facilitating efficient and selective transformations in synthetic chemistry.

Refernces

Soluble molecular dimers of CaO and SrO stabilized by a lewis acid

10.1002/anie.200904054

The research focuses on the synthesis and characterization of soluble molecular dimers of calcium oxide (CaO) and strontium oxide (SrO) stabilized by a Lewis acid, specifically the compounds [{L1Al(Me)(m-O)Ca(thf)}2] (7) and [{L1Al(Me)(m-O)Sr(thf)}2] (8). The reactants used in the experiments include [LAlMe(OH)] (1), [Ca{N(SiMe3)2}2(thf)2] (5), and [Sr{N(SiMe3)2}2(thf)2] (6), with [L1Al(Me)] acting as a Lewis acid and coordinating to the oxygen atoms in the final products. The synthesis involves deprotonation of a methyl group in the ligand backbone, leading to the formation of CaO and SrO cores. The compounds were characterized using NMR spectroscopy, EI mass spectrometry, elemental analysis, and X-ray structural analysis. Theoretical calculations using density functional theory were also performed to understand the electronic structure and bonding properties of the synthesized complexes.

Copper-Catalyzed Enantioselective Ring-Opening of Cyclic Diaryliodoniums and O-Alkylhydroxylamines

10.1021/acs.orglett.9b02267

The research focuses on the development of a method to prepare 2-hydroxyamino-2′-iodobiaryls through a Cu-catalyzed enantioselective ring-opening reaction of cyclic diaryliodonium salts with O-alkylhydroxylamines. The study highlights the use of 3,5-di(tert-butyl)phenyl bis(oxazoline) as the optimal ligand, which enabled the achievement of up to 99% enantiomeric excess (ee) values. Calcium oxide (CaO) was identified as a crucial base that significantly improved yields and inhibited side reactions. The research also explored the substrate scope, demonstrating that various substituents on the benzenesulfonamide moiety and different O-alkylhydroxylamines were compatible with the reaction, yielding products with high enantioselectivity. Additionally, the study showcased the utility of the synthesized products through further modifications, such as N?O bond cleavage and selective removal of protecting groups, highlighting the potential applications of these hydroxylamines in synthetic chemistry.