G. Uhde’s research while affiliated with Firmenich and other places

... The measured IR and VCD spectra of optically pure (À)-a-thujone, (þ)-b-thujone and (þ)-camphor are presented in Fig. 2. According to the literature [29,30], the absolute configurations of (À)-a-thujone and (þ)-b-thujone are respectively (1S,4R,5R)-(À)-4methyl-1-(propan-2-yl)-bicyclo-[3.1.0]-hexan-3-one and (1S,4S,5R)-(þ)-4-methyl-1-(propan-2-yl)-bicyclo-[3.1.0]-hexan-3one ...

Reference:

Analysis of the major chiral compounds of Artemisia herba-alba essential oils (EOs) using reconstructed vibrational circular dichroism (VCD) spectra: En route to a VCD chiral signature of EOs

... Over the past 50 years, the chemical composition of essential oils and various concentrated extracts made from V. odorata were analyzed, including essential oils made from the flowers (Uhde and Ohloff 1972), "aerial parts" (Hammami et al. 2011), unspecified plant parts (Abdel-Rahim 2016, and leaves (Akhbari et al. 2012), as well as "absolutes" isolated from leaves (Saint-Lary et al. 2014), and an oil extracted from a "concrete" made from V. odorata leaves and flowers (Mohamed and Ghatas 2016). Aalthough essential oils are obtained through various distillation methods and are primarily composed of volatile compounds, concretes and absolutes are obtained through solvent extraction and contain nonvolatile compounds, too (Saint-Lary et al. 2016). ...

Reference:

Temporal, Developmental, and Comparative Characterization of the Floral Volatile Emissions of the Famously Scented Violet Species, Viola odorata

... The question how to obtain such a hydrocarbon is also very important. It is known that the UV [10] or highhtemperature (>240°C, [9]) treatment makes it possible to rearrange caryophyllene with the formaa tion of compound (2) and its C 4 isomer. In the case of the UV treatment, the main resulting compound repp resents an isomer, where methyl and vinyl groups are located oppositely to those of compound (2). ...

Reference:

Extractive compounds of birch buds (Betula pendula Roth.): II. Carbonyl compounds and oxides. Esters

... For information on the title compound as used as a key intermediate in chemical synthesis, see: Eugster et al. (1969); Naef & Decorzant (1986); Snowden et al. (1982); Fehr & Galindo (1986; Heather et al. (1976). For hydrogenbond graph-set notation, see: Etter et al. (1990); Bernstein et al. (1995). ...

Reference:

2,6,6-Trimethyl-cyclo-hex-2-ene-carb-oxy-lic acid.

... 188 Enantiomeric purities of terpinen-4-ol are significantly different when Melaleuca and Eucalyptus oils are compared in view of authenticity assessment. 55 The absolute configuration of terpinen-4-ol was determined by Ohloff and Uhde (1965). 189 ...

Reference:

Enantiomeric distribution of odorous oxygenated monoterpenes in aromatic plants

... For the investigation of those parameters, which are of importance for the distinction of the characteristic flavors 'fruity' and 'meaty', 35 furan derivatives were selected from the literature [14][15][16][17][18][19]. The chemical structures of these aroma compounds are depicted in Figure 1, and their exact aroma qualities are listed in Table 1. ...

Reference:

Structural Features for Furan-Derived Fruity and Meaty Aroma Impressions

... NH 4 Cl (16 mL, 20% in water) were then added to the reaction mixture, which was then cooled to room temperature. The mixture was extracted with EtOAc (70 mL × 3) and the organic phase was washed with saturated NaHCO 3 (50 mL), dried with MgSO 4 , concentrated in vacuo to give the crude product. After distillation, α-damascone (1.52 g, 72.4% yield, 97% chemical purity (GC)) was obtained as a sticky oil. ...

Reference:

Preparation of α-damascone